"Don't Let It End" is the third track and the second top 10 single on the 1983 album Kilroy Was Here, by Styx. The song is also reprised at the end of the album.

"Mr. Roboto" is a song by American rock band Styx, released as the lead single from their eleventh studio album, Kilroy Was Here (1983). It was written by band member Dennis DeYoung. In Canada, it went to #1 on the RPM national singles chart. It entered the US Billboard Hot 100 on 12 February 1983, reaching No. 3 in April.