Yes' Roundabout. The back story here is that the band had been tucked away in a remote place in the UK for a long time writing and doing studio work. They hadn't seen their girlfriends for a long time and they were lonely and depressed. On the day(s) before the girls were coming for a visit, the band was so happy about the upcoming reunion that they wrote this song--maybe their biggest hit. It's all about the driving and sightseeing they had planned for their visit.