"Elon Musk is an absolute rock star because he is not beholden to anybody," Simmons told TheStreet (TST) - Get Report . Simmons said he appreciates Musk's bold ideas on space, solar power and electric cars.
"I am a big fan," Simmons added.
Musk could use some fans beyond the music industry.
Tesla shares have plunged 11% this year on fears of mismanagement by Musk and a likely capital raise to support the Model 3 roll-out.
According to Goldman Sachs analysts, Tesla Inc. needs to raise a ton of money -- and fast.
By 2020, analyst David Tamberrino says the automaker may need to raise up to $10 billion in the capital markets. Whether that comes from secondary stock offerings, bonds, debt, convertibles or some combination of all these options doesn't matter. It's likely, and investors are growing worried.
Meanwhile, Musk's notoriously all-over-the-place management style may be fueling a talent exodus at Tesla.
Matthew Schwall, who had been the director of field performance engineering at Tesla, has reportedly left the company to join rival Waymo.
Schwall's departure comes hot on the heels of Tesla's senior vice president of engineering Doug Field deciding to step away from the company to spend more time with his family.
"Doug is just taking some time off to recharge and spend time with his family. He has not left Tesla," the Tesla spokesman said.