Dickey Betts Tempo? matherton charts harmonic probable speed – the allman brothers band-Jessica March 5, 2019 by Matherton Timing Dickey Betts / Jessica / matherton_tempo_map / The Allman Brothers “Jessica” is a song written and performed by the Allman brothers band in the early 1970s. This was a Dickey Betts song. Jessica / probable harmonic rhythm chart Share this:TweetLike this:Like Loading... Related The AuthorMatherton Attorney/musician. Recovering from a brain aneurysm.