The rock matriarch – who is married to Ozzy Osbourne – made her feelings on the matter VERY clear via a flurry of Twitter messages posted on Monday (15 September).
A rattled Sharon said: "U2, you are business moguls not musicians anymore. No wonder you have to give your mediocre music away for free cause no one wants to buy it.
"Guys, nothing is for free. How much you making?"
Sharon also branded the Irish band a "bunch of middle age political groupies" and lashed out at iTunes and record mogul Jimmy Iovine.
U2 (perhaps unsurprisingly) haven't responded.
Bono and the band hit the headlines last week when their new album Songs of Innocence was automatically downloaded to the music libraries of around 500 million customers worldwide and some users complained as they hadn't wanted the album.
Apple has now released a tool which allows customers to remove the record from their iTunes library.
After the initial release to customers' accounts, Bono posted a message to U2's official website explaining: "It's free to everyone on iTunes thanks to Apple. To celebrate the ten year anniversary of our iPod commercial, they bought it as a gift to give to all their music customers. Free, but paid for."
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