 " True Blue " is a dance @-@ pop song inspired by the Motown 's girl groups from the 1960s which are considered the direct <unk> of Madonna 's musical sound . The song is composed in the key of B major . It is set in compound quadruple meter , commonly used in doo @-@ wop , and has a moderate tempo of 118 beats per minute . " True Blue " features instrumentation from a rhythm guitar , a synthesizer , keyboards , and drums for the bassline , with a basic sequence of I – vi – IV – V ( B – G ♯ m – E – F ♯ ) as its main chord progression . 
