The song (Christmas) Baby Please Come Home was recorded by Darlene Love in 1963. If you watch David Letterman you know that Darlene Love performs this song on the last show before Christmas every year.
In 1987 the first cover version was recorded by U2 during a sound check in Glasgow Scotland. Darlene Love supplied background vocals for the track which ended up on the album, A Very Special Christmas. Read the lyrics here. Read more about the original here.