When they weren't playing with The Grateful Dead, these musicians were known to sit in for a studio feature or two.

These songs might not have loudly pushed country music to new heights, but they did, and they did so rather quietly.

Jennifer Lopez shared insight into how her and ex Marc Anthony's 17-year-old twins Max and Emme feel about her career amid her 'Up All Night' Las Vegas Residency in an exclusive E! News interview.