There have been at least two bands called Custard:

1.Custard is a German power-metal band founded in 1987. They have released four full length albums so far (the latest in 2008).

2. Custard was a Australian alternative rock band band led by singer Dave McCormack. They formed in Brisbane and had a few triple hits with songs like Apartment and Girls like That (Don't Go for Guys Like Us)
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