GRAMMY-winning rock guitarist/singer/songwriter Gary Clark Jr. celebrates Prince at "Let's Go Crazy: The GRAMMY Salute To Prince" with powerhouse covers of Sign O' the Times deep cut "The Cross" and "Let's Go Crazy," the latter of which he performs with H.E.R.

"As a guitar player, I think he's the best guitar player in the world. I don't think anybody could touch him," the "This Land" singer tells us backstage.

Tune in to CBS or CBS All Access on Tues., April 21 from 9–11 p.m. ET/PT to catch the shimmering musical special.

Read More: Gary Clark Jr. On Prince: "He's The Best Guitar Player In The World"