Formed in 1939 as a non-profit-making performing right organization, BMI was the first to offer representation to songwriters of blues, country, jazz, r&b, gospel, folk, Latin and, ultimately, rock & roll. .
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Broadcast Music, Inc. (BMI) collects license fees on behalf of songwriters, composers and music publishers and distributes them as royalties to those members whose works have been performed.
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You can question BMI's validity if you want, but you'll just be making yourself look silly.
BMI represents more than 375,000 songwriters, composers, and publishers with more than 6.5 million works.
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Chet Atkins, Fred Foster, Charlie Daniels, Billy Cox, TOTO, Booker T. & .The MGs, The Crickets, Duane Eddy, Al Kooper . . .
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a lot more musicians and bands thought it was worth it.
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BMI is Free, ASCAP is $35. Hell - I don't need to 'sell' BMI . . . they've been around since before everyone here was born.
Other differences, too - but do your own research.
Actually, there's a thread on this here somewhere, from 2007 or 2008 . . .