"Drummers don't write - or at least, that's what everybody believes"

In this quote, Tony Williams, a distinguished drummer, challenges the common belief that drummers do not compose music. He recommends that this is a widely held misconception, and that drummers are typically ignored as songwriters. Williams might be indicating that drummers are not offered enough credit for their contributions to the music industry, which their function in producing music is frequently undervalued. By specifying that this is a belief held by "everybody," Williams is highlighting the prevalent nature of this misconception. He may be motivating others to acknowledge and value the innovative capabilities of drummers.