Think about it a minute.
Many jazz players like to improvise over "standards" - which are invariably copyrighed materials.
The Forum Rules get in the way of that, though.
And, while there are jazzers who write their own material, I think you will find far more who are not writers but prefer to improvise over the copyrighted songs already out there in the jazz world.
--Mac Bingo, that is my story and I am sticking to it. 
BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6
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