Nine Inch Nails is distributing more music for free online.

The band released a free album Monday, one day after allowing Facebook users to download a single track. The album, called The Slip, is the second Nine Inch Nails' album released online. It includes the tracks "Echoplex" and "Discipline," both of which were made available online before the entire album's release.

Fans have to sign up, but that's free, and the music comes in MP3, M4A lossless, 24/96 WAVE, and FLAC formats. It includes art. The songs will be distributed on CDs and vinyl in a few months.

"This one's on me," Reznor wrote on the band's site.

In March, Nine Inch Nails front man Trent Reznor offered fans the opportunity to download some songs from his new album, Ghosts I-IV, for free. He also offered packages beginning at $5 and ending at $300 for an ultradeluxe edition. That brought the band more than $1.6 million and crashed the band's Web site. The top-price edition sold out within three days.

Reznor's pricing scheme was more successful than Radiohead's attempt last year to sell albums while allowing fans to pick their price. Radiohead's In Rainbows lacked copyright protection, and the band never released statistics on the number of downloads or the prices paid. However, Radiohead did stop offering the album for free after the CD went on sale in stores, leading many to speculate that the promotion failed to harness profits.

ComScore reported that 63% of music fans who downloaded the Radiohead album did not pay at all, and those who paid spent an average of $6. Since nonpaying fans outnumbered those who paid for the album, the average price for all the downloads sold sank to about $2.25, according to ComScore's figures.