Folk rock group, Mumford & Sons is heading for a massive week. The rock quartet’s new album “Babel” is on course to sell as much as 600,000 copies by the end of the tracking week on Sunday, Sept. 30 — so say industry sources. The album, released on Sept. 25, will easily debut atop the Billboard 200 next week, giving the band its first chart-topper.

“Babel’s” forecasted sales should give the band the biggest debut week this year, far surpassing Justin Bieber’s “Believe” launch with 374,000 according to Nielsen SoundScan.

The success of Babel is only surprising if you haven’t been paying attention. Mumford & Sons’ debut, “Sigh No More”, was a classic slow-burn hit, and gradually sold 2.5 million copies since it was released in 2010. While they do have some chart hits – their current single “I Will Wait” peaked at Number 23 on the Hot 100 in August – they have mainly built their audience through relentless touring and word-of-mouth.

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Source: Billboard.com