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I heard that rock was created from blues. But most of the scales in rock are either major or minor. But blues scales are created from adding chromatic notes to a pentatonic scale.

Isn't rock more similar to say classical or pop music since they both share the same regular major/minor scales?

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    Which rock are you talking about? Is Led Zeppelin not rock? What about John Mayer? There is a lot of rock and pop music that is based on classical music (like Billy Joel or Yngvie Malmsteen), and a lot based on jazz (some Beatles, some of everything really) and a lot based on delta and/or Chicago blues (Zep, Stones). Rock and pop take influences from all over, including African, Asian, and Latin music. Any source claiming that rock is primarily based on blues and nothing else is wrong. But some bands are primarily blues influenced. Jul 18 '19 at 20:00
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    I saw that your question was downvoted, then I saw the excellent answer written by @topo morto. So since your question can inspire such a great answer I upvoted your question, because without that question we wouldn't have that great answer. I upvoted the answer also of course. Jul 18 '19 at 22:08
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    @LarsPeterSchultz I think you're being a little too generous - but at least I managed to get some Zappa in there...
    – topo morto
    Jul 18 '19 at 22:17
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    The Blues scale is created by adding ONE chromatic note to the pentatonic. That's all. Except that real Blues also incorporates a myriad of other notes 'in the cracks', which cannot really be called chromatic in its proper term. I think your question is based on a false premise. And Blues/Rock is a very wide spectrum of music.
    – Tim
    Jul 19 '19 at 6:19
  • I think the confusion here is that you don't know the history of "rock" and all its variants. Perhaps it is not true that Blues made Rock. The term Rock and Roll (I think) was first applied to Elvis Presley's music. That is heavily blues oriented (more like copied). From that point the meme evolved, infecting numerous people all over the globe. The Brits were inspired by it but eventually created their own modern music that quotes these blues classics but also injects new ideas. To say that Opeth, or Zappa, or Yes, etc is "Rock" is to call out the trunk of the family tree.
    – user50691
    Jul 19 '19 at 19:22
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'Rock' is an umbrella term referring to an area of music containing many sub-genres that has been evolving for nearly 70 years now. Even at its birth, it evolved from multiple genres such as Country, Blues, and Boogie-Woogie piano music. As time has moved on it has taken in more and more influcences such as folk, classical, jazz... and ultimately, every other genre out there. Accordingly, it has incorporated harmonic pallettes from all those styles - and in some ways, found ways to fuse them together.

most of the scales in rock are either major or minor

First, a question - where does that assertion come from? is it your impression or does it come from a statistical analysis of a corpus of work?

Doubtless there is a lot of rock music that is based on major and minor scales. There's also an awful lot that is based around the blues scale - I bet if you asked 10 guitarists to play a 'rock riff', more than half would play something based around a blues scale. There are a lot of modal influences in rock too. (I've sometimes thought that there seems to be a kind of 'Rock scale' or 'rock key' that incorporates aspects of Major, blues, minor, and perhaps the Mixolydian mode.)

As an illustration of something that exhibits a kind of bluesy rock tonality, Have a listen to Joe's Garage. The first part is fairly straightforward major - then pay attention to what happens at about 4 minutes, when they're making it sound more 'rocky'. They're certainly not sticking to straightforward major - or minor - at that point.

blues scales are created from adding chromatic notes to a pentatonic scale.

It's not as simple as that. The archetypal blues sound is all about bending notes through ranges of pitch (which you can hear a little of in the Joe's Garage vocal). There are simplified versions of the blues scale which could be described in the way you have, but that wouldn't qualify as a full description of classic blues tonality.

Isn't rock more similar to say classical or pop music

Maybe - but only in that rock, pop, and classical are all huge, sprawling families of genres that have adopted many different influences over the years, and include examples using many different types of scale.

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    I'm not sure it's fair to use Zappa as an example, because he is so good at defying genres.
    – jdjazz
    Jul 20 '19 at 20:14
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This is a style question, not really a theory question.

Let's skip the discussion about blues scale versus blue notes, blues harmony, and what is rock tonality.

The question is...

...how is rock founded from blues

The easiest, most direct answer I can think of is: Joe Turner and Bib Mama Thornton.

Joe Tuner

Big Mama Thornton

The Rock & Roll versions are:

Initially rock was just blues (performed by whites) with a different performance style. Regarding scales and harmony there is no difference in the 'blues' and early 'rock and roll'.

...But most of the scales in rock are either major or minor...

Rock is too broad a label for this question. We can go from Slayer to Elvis under the rock umbrella! It's like lumping Turlough O'Carolan and J.S. Bach in the same category, because both used major scales and lived during the same time period. Try to differentiate what style of rock you are talking about.

This is "rock" when blues is removed...


EDIT

You mention blues, rock, pop, & classical and are looking at similarities and differences. All of them share a commonality which is the diatonic scale (yes, it applies to blues.) In terms of history and evolution of styles you should consider how the hymn is a foundation. In America it becomes the spiritual. Also the waltz and late 19th century/early 20th century sheet music songs are the ancestor of pop. In both cases, hymns and waltzes, the diatonic scale is the foundation. Other styles evolved from them. Instead of make scale/style associates think about harmony and overlapping, evolving styles.

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    Carolan did not use a violin, he was a harpist :) Jul 19 '19 at 19:12
  • @JonKiparsky, where was my head! I'll correct that. Jul 19 '19 at 20:33
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My take on this question is that it seems to me that the term "Blues" is rather loosely applied to a lot of music that has it's origins further back in history, such as "Negro Spiritual" and even further back than that in "Jungle rhythm". Both of these categories are often found in "Blues" and in early and even current "Rock" music. When I hear someone say Rock came from "Blues" or Rock came from "Country", it always sounds to me like one genre is trying to steal the thunder from another genre, and I try to disregard it. I prefer to just appreciate each classification, whatever it may be, for the way it makes me feel when I listen or play it. Also, it occurs to me that the major scale or the blues scale is only a part of what makes rock a separate category, there's also the rhythm, the lyric, the "attitude", all often very similar in nature to Blues, and Country, and just about anything else we've ever heard. I understand that it's important to know the history, but in this case the history doesn't seem to be helping one to understand the music and may be confusing the issue. My impulse is to just accept it for what it is.

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