The best replacement for beefheart is zappa.

The best alternatives to beefheart are rated as following:
★★★★★  zappa
★★★  tom waits
★★  dweezil zappa

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Speaking about beefheart, one probably shouldn't forget about frank zappa.

Other search terms related to beefheart and their ratings are:
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beefheart
zappa
tom waits