I got a book as a present from my grandma called "Jazz Theory Book" by Mark Levine. I thought the bank holiday was a great day to start reading it. I've spotted something in the book that confuses me.
Above the stave is "Bb7", and "Eb7". I know what they mean such as "B flat 7". But, I'm not sure why they're above the stave. Does it mean to play a Bb7 chord whilst playing "D, Eb, E, F" as there is no mention of chords?
Here's an image from the page in the book: