The Mark IV were an American musical ensemble, based in Chicago, consisting of Bob Peterson, Leon McGeary, William (Bill) Thomas, and Michael McCarthy. They were originally named The Rhythm Makers. They later changed their name to Mark V, and then – as members left – to The Mark IV, and eventually ending in the 1980s as The Mark IV Trio. The band appears to have recorded only as The Mark IV, however, and they had their biggest hit in 1959 with the novelty song, "I Got a Wife" (Mercury 71403). "I Got a Wife" was set to a lively polka beat, and reached No. 24 in US Billboard Hot 100 chart, and No. 14 on Canadian radio station CHUM's "Chum Chart". The song was later covered by Frankie Yankovic and other polka bands.