Will.I.Am “This Is Love” (feat. Eva Simons) on Letterman 7/26

Will.I.Am “This Is Love” (feat. Eva Simons) on Letterman 7/26

Will.I.Am featuring Eva Simons performs “This Is Love” on Late Night With David Letterman.

Milo Greene “1957” on Letterman 7/25

Milo Greene “1957” on Letterman 7/25

Milo Green performs “1957” on Late Night With David Letterman.

Allen Stone “Sleep” on Letterman 7/24

Allen Stone “Sleep” on Letterman 7/24

Allen Stone performs “Sleep” on Late Night With David Letterman.

Rufus Wainwright “Jericho” on Letterman 7/23

Rufus Wainwright “Jericho” on Letterman 7/23

Rufus Wainwright performs “Jericho” on Late Night With David Letterman.

Loudon Wainwright III “Older Than My Old Man Now” on Letterman 7/12

Loudon Wainwright III “Older Than My Old Man Now” on Letterman 7/12

Loudon Wainwright III performs “Older Than My Old Man Now” on Late Night With David Letterman.

Tom Waits “Chicago” on Letterman 7/9

Tom Waits “Chicago” on Letterman 7/9

Tom Waits performs “Chicago” on Late Night With David Letterman.

The Gaslight Anthem “45” on Letterman 6/27

The Gaslight Anthem “45” on Letterman 6/27

The Gaslight Anthem performs “45” on Late Night With David Letterman.

Maroon 5 “Payphone” on Letterman 6/26

Maroon 5 “Payphone” on Letterman 6/26

Maroon 5 performs “Payphone” on Late Night With David Letterman.

Diamond Rugs “Blue Mountains” on Letterman 6/25

Diamond Rugs “Blue Mountains” on Letterman 6/25

Diamond Rugs perform “Blue Mountains” on Late Night With David Letterman.

Michael Kiwanuka “I’m Getting Ready” on Letterman 6/20

Michael Kiwanuka “I’m Getting Ready” on Letterman 6/20

Michael Kiwanuka performs “I’m Getting Ready” on Late Night With David Letterman.

Walk The Moon “Anna Sun” on Letterman 6/19

Walk The Moon “Anna Sun” on Letterman 6/19

Walk The Moon performs “Anna Sun” on Late Night With David Letterman.

The Pierces “You’ll Be Mine” on Letterman 6/18

The Pierces “You’ll Be Mine” on Letterman 6/18

The Pierces perform “You’ll Be Mine” on Late Night With David Letterman.