Day After Day is the biggest hit by Badfinger. It peaked on the Billboard Hot 100 at spot number 4 and topped other charts around the world. It was recorded for Badfinger's 1971 album entitled Sraight Up. It was written and sung by Pete Ham and produced by George Harrison who also played the slide guitar solo. The song also featured Leon Russell on piano. The final mix of the record was done by Todd Rundgren after Harrison's Concert for Bangladesh. It was certified gold becoming the band's first and only gold single and remains to this day as Badfinger's best known song.