Last night, Robert Glasper hosted Help Houston Heal, a benefit concert at the Troubadour in Los Angeles, CA, to raise money for those affected by the recent destruction caused by Hurricane Harvey, and the night featured surprise appearances from the likes of Herbie Hancock and Kamasi Washington, along with several previously announced guests.

As Glasper posted in a live video on his Facebook, announced guest Lupe Fiasco led a collective including Hancock and Washington, with extended improvisation and interplay between the rapper and the saxophonist.

Proceeds from last night’s event went to Break of Life’s Hurricane Harvey Relief Fund. Watch a clip of the collaboration below.