What is an epic song with no vocals?

The Allman Brothers wrote two beautiful instrumentals, "Jessica" and "In Memory of Elizabeth Reed" that hover near the 7-minute mark, boast tight, complicated arrangements, and do a great job of showcasing the Guitarists and keyboardist(s) with generous solo sections. Lately I've been really enjoying the music of Rachel Flowers; her 8-minute song "Away" has no vocals and really stands out.