U2‘s Songs of Innocence may be one of the most controversial album releases of all time, with a firestorm erupting over Apple’s decision to offer it for free by placing it in all their customers’ iTunes accounts. And, now, according to Apple, it just might be one of the most successful.

Apple executive Eddy Cue said in a statement released Monday that the album has been “experienced” by more than 33 million people. Cue said, “We wanted to thank our customers and share our love of music by gifting them Songs of Innocence. Just six days after its release on iTunes, a record breaking 33 million people have already experienced the album.”

iTunes has 500 million account holders, so obviously only a fraction of those have listened to it. And of course, not everyone was happy with the way the album was released. Apple acknowledged that, too, by posting instructions on how to delete it from their iTunes music library and purchases.