"Homesick" is a song by Christian rock band MercyMe. Written by Bart Millard, the song is an expression of grief and longing that was written after the band experienced the deaths of nine people they were connected to in a short period of time. "Homesick" was included on MercyMe's third studio album Undone and was released as the second single from that album.

"Homesick" received positive critical reception, with some critics considering the song one of the best from Undone. "Homesick" was successful on both Christian and mainstream radio, peaking at the top on the Radio & Records Christian AC Indicator and Soft AC/INSPO charts, number 3 on the Billboard Hot Christian Songs and Hot Christian AC charts and the Radio & Records Christian AC chart, as well as peaking at number 9 on the Billboard Adult Contemporary chart. It was ranked at number 13 on the Billboard 2005 year-end Hot Christian Songs and Hot Christian AC charts, and at number 20 on the year-end Adult Contemporary chart.

"Homesick" was written during a time of hardship for the band—nine people close to MercyMe's band members had died in a short span of time. Lead singer Bart Millard initially wrote the chorus to "Homesick" following a funeral service for two infants that died in pregnancy, but did not finish the song, as didn’t want to fake his way through writing the song. However, following the death of Millard's brother-in-law, Chris, in a car accident, Millard finished the song so as to play it at Chris's funeral. Millard and the rest of MercyMe intended the song only to be played once—at Chris's funeral—but Millard's mother-in-law encouraged them to record it. Although the record they were going to release, Undone, was essentially complete, the band returned to the studio to record "Homesick" for inclusion on the project.

"Homesick" is a ballad with a length of three minutes and forty-one seconds. Lyrically, the song is an expression of grief, pondering Heaven and the time it takes to get there, as well as anger, confusion, and brokenness. The song is set in the key of F major and has a moderate tempo of 72 beats per minute. Millard's vocal range in the song spans from C₄–A₅.

...
Wikipedia