Fall Out Boy famously — or infamously — recorded a song with Courtney Love on their comeback Save Rock and Roll album ... a fact that, you'd think, would earn them permanent blacklist status by any of Love's (many) enemies.

Though, from the sound of things, Love's former sparring partner Ryan Adams is willing to forgive and forget. Because he recently invited FOB into his Pax Am studio to record an album's worth of songs over two raucous nights.

"It was very much hanging out, and somehow some music got recorded," Fall Out frontman Patrick Stump told MTV News. "We're very lucky, we have a cool job; sometimes you just get to hang out and someone asks you questions about it."

"I think we didn't know what to expect when we went in, which is part of the fun, and I think it's part of what Ryan wanted out of it as well," guitarist Joe Trohman said. "When you're in the studio, and you spend most of the time hanging out, it's a good thing because then all of a sudden you're like 'Wow, how did I just record, like, ten songs?' And that's sort of what ended up happening; everything was off the cuff."

Of course, there's still no word when FOB fans will get to hear any of the tunes — a rep for the band did not respond to MTV News' request for comment — but, from the sound of things, they'd represent a definite departure from the polished studio songs on Save Rock and Roll. Mostly because half time, the band didn't even know they were recording.

"One of the most fun things about it [is] that it's kind of this accidental thing," Stump said. "It's analog, it's just tape; he'd be rolling the tape, like 90 percent of the time, even when we weren't sure what was happening. We would rehearse a song and then be like 'Alright, let's take it!' And he's like 'We're good, we got that one!'"