Back in 1977 - Beach Boy Dennis Wilson his one and only solo album - Pacific Ocean Blue.   There was however - one unfinished song - Holy Man .. and in 2009 - Foo Fighters Drummer Taylor Hawkins added vocals to the song, but it remained unfinished ... until now - 10 years later -Roger Taylor and Brian May of Queen have contributed music and vocals to it as well and the song is finished ... you can hear it below: 

From the Foo Fighters": 

10 years after Taylor Hawkins added vocals to Dennis Wilson’s long unfinished 1977 instrumental track, “Holy Man,” guitarist Brian May and drummer Roger Taylor of Queen have once again brought new life to the track.