Band puzzle 21?!

Question: Band puzzle 21!?

The spelling for the second half is missing a letter!.

[Super][Excessum]Www@Enter-QA@Com

Answers:

Megadeth!?

That's gotta be it!.

TWO IN A ROW!?!

YES! 20 seems hard, though!.Www@Enter-QA@Com

Super Excess ***!?Www@Enter-QA@Com

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