With the exception of instrumental tracks, there are a total of 20 songs from Sabbath's albums with Osbourne that never made the cut live, according to Setlist.fm. Therefore, there may have been a time where a song was played for a specific event that wasn't a concert.

They created some incredible songs during their run but there's one Black Sabbath song that Ozzy Osbourne considers to be their most important

Ozzy Osbourne to reunite with Black Sabbath for his final bow - Legendary rock artist lives up to his promise to play one final show