Here are 10 times rock and metal musicians were an emergency fill-in.

The show must go on, even when an integral member of a band can't perform. Luckily, the music industry does not have a shortage of professionals that can stand in for artists when this happens, including some famous faces.

READ MORE: Rock + Metal Bands Who Don't Have a Bassist

From last-minute fill-ins for a concert to replacing a member for an entire leg of a tour, crews find a way to make it work. Some fill-ins haven barely had any time time to practice with the band prior to hitting the stage, while others were able to undergo full preparation and rehearsals to deliver for the fans.

See 10 of the most epic fill-in moments below.

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