Ann Wilson and Joe Walsh are among the classic rock stars who've been tapped to play on the debut album by Microsoft co-founder Paul Allen and his group the Underthinkers. The album, 'Everywhere at Once,' will be released on Aug. 6.

The record will also include contributions from Wilson's Heart bandmate and sister AnnChrissie Hynde, Derek Trucks, Roger Waters' tour guitarist Doyle Bramhall II, Los Lobos' David Hidalgo and Ivan Neville.

Allen -- who wrote or co-wrote all of the album's 13 songs -- plays guitar on the blues-leaning tunes. Before forming the Underthinkers, he was a member of a band called the Grown Men.

But he's best known as one of the co-founders of Microsoft in 1975. The Seattle native -- who saw Jimi Hendrix perform when he was 16 -- was the company's chief technologist until 1983. Since then, he's spread his wealth to various organizations around the country. He's also shared the stage with some pretty famous people, including Mick Jagger, Carlos Santana, Bono, Ron Wood and Dave Grohl.

Because Allen is filthy rich, proceeds from 'Everywhere at Once''s sales will go toward the EMP Museum's educational programs.

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