Home Features Tosin Abasi: Talks About Allan Holdsworth and Progressive Music. Tosin Abasi: Talks About Allan Holdsworth and Progressive Music. planetsixstring October 1, 2017 comments off Tweet on Twitter Share on Facebook Google+ Pinterest Tosin Abasi Talks About Allan Holdsworth and Progressive Music and plays a bit of the head of “Letters of Marque”. Tosin Abasi Talks About Allan Holdsworth and Progressive Music.