Here's a bunch of rebuses for you. Each represents a band or a musician.
Hope you'll enjoy :)
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Editing now since no answer was selected, and to put all answers in one place.
Mario Duplantier from the band Gojira/Godzilla
Stuck in the sound
Electric Wizard. It's Harry Potter (a wizard) holding a resistor (an electronic component).
2) I don't know how well known this band is, but it fits the image too perfectly to ignore: