Which song was the glam rock band Sweet's only UK number one?

The Sweet (also known as Sweet) are a British glam rock band that rose to worldwide fame in the 1970s. Their best known line-up consisted of lead vocalist Brian Connolly, bass player Steve Priest, guitarist Andy Scott, and drummer Mick Tucker. The group was originally called Sweetshop.

"Block Buster!" (also sometimes listed as "Blockbuster!") is a 1973 single by Sweet. Written by Nicky Chinn and Mike Chapman, and produced by Phil Wainman, "Block Buster!" was the band's sole UK No. 1 hit. Released in January 1973, it spent five weeks at the top of the UK Singles Chart, and also made #1 in the Netherlands, Germany, Austria and Ireland, and #3 in Finland, Switzerland, Denmark and Norway. Outside Europe it peaked at #1 in New Zealand, #29 in Australia and at #73 on the American Billboard Hot 100.

Its Muddy Waters-inspired blues riff is markedly similar to the one featured on fellow RCA act David Bowie's "The Jean Genie", released shortly before, but all parties maintain that this was a coincidence.