Warner Bros vice-president Seymour Stein fell in love with the band at a gig in Brighton, reports The Sun.
Stein's famous signings include The Smiths, The Ramones and Talking Heads. He is also the co-founder of Sire Records.
The Danish pop act have already scored two top 20 hits in the UK. Their debut album This Is Alphabeat was released on Monday.
> Click here for our review of the Alphabeat album