I am wondering what connotes plagiarism--or at least a lack of artistic integrity--with regards to chord progressions. Could you indicate a progression which: a) should be used openly, b) shows a lack of creativity/plagiarism, and c) somewhere in the middle?
Here are some examples to get you thinking. In my view, these go from 'artist-specific' to 'standard':
Coltrane Changes (major thirds cycle)
The Beatles progression (I-II-IV-I)
The Hendrix chord (dominant seventh sharp ninth)
Ascending Augmented Progressions (i.e Stevie Wonder's For Once In My Life)
Ascending Bass Lines (i.e. Bob Dylan's Like a Rolling Stone)
(I apologize that this list is sort of crude, but I only know of so many types of progressions)
This leads to my second question: is it fair to criticize a songwriter for using a 'highly specific' chord progression?