"Sense of Doubt" is an instrumental piece written by David Bowie in 1977 for the album "Heroes". It was the first of three instrumentals on Side Two of the original vinyl album that segued into one another, preceding "Moss Garden" and "Neuköln". Cited as "portentous" and "thoroughly foreboding", "Sense of Doubt" is one of the darker tracks of the album, with a descending four-note piano motif juxtaposed with "an eerie synth line like a scrap of sound from a silent expressionist-era soundtrack".