[3] In 1960, Sonny Boy Williamson II recorded "Checkin' Up on My Baby" as an uptempo Chicago blues shuffle that features his harmonica playing.
[4] I'm checkin' up on my baby, find out what she puttin' down (2×) So many nights and days, you know I have been out of town Backing Williamson on vocal and harmonica are Otis Spann on piano, Robert Jr. Lockwood and Luther Tucker on guitars, Fred Below on drums, and an unidentified bassist.
[1] The song was first released on the Williamson Chess Records compilation The Real Folk Blues in 1966.
[5] "Checkin' Up on My Baby" has been interpreted and recorded by a variety of artists, often by blues harp players.
[6] The Red Devils' Lester Butler performed the blues harp for the piece, whose playing impressed Jagger; "At one point I heard Rick [producer Rick Rubin] call out, 'Hey Mick, play some harp!'