Spotify slashed the price for a premium account from $9.99 to $4.99 for U.S. college students on Tuesday. The discount will likely provide a solid spike to Spotify's user headcount, which at last count tallied 24 million monthly active users and 6 million paying subscribers.

The advertising-free subscription allows students to access its library of more than 20 million songs online or offline on mobile, tablet, desktop and home entertainment systems.

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The deal applies only to students currently enrolled at a U.S. accredited institution, and Spotify will confirm eligibility using an applicant's name, college name and date of birth.

However, as I found out trying to apply as a non-student, Spotify may ask for additional information and documents such as college email address or a copy of a student ID card, class schedule, letter from a college official, transcript or tuition receipt.

A student who already has a subscription can still register for the discount, though the deal won't be applied until his or her renewal date, which is on each user's subscription page.