Harmonica: How to Develop Your Own Style
Bad Imitation leads to Innovation.
How, when first learning to play, I listened to Paul Butterfield and tried to guess how did what he did by looking at his album cover picture.
Butterfield was a huge influence, but at some point in my developing years I stopped listening to other harp players and started to get ideas from other instruments only. Instruments in Pop songs, country tunes, movie themes all served as a library of ideas to explore.