Digital sales of Madonna [ tickets ]'s new single, "4 Minutes," have reached one million-plus, making it the second single--after Rhianna's "Umbrella"--to hit that mark in five weeks, according to a press release.

While there is plenty of money being spent on the single, a few thousand fans won't have to pay a dime to see the pop star in concert this week. Madonna is playing an free show at the intimate Roseland Ballroom April 30 to celebrate the release of her new album, "Hard Candy," which hits stores today (4/29). Tickets to the concert are being given away on a first come, first served basis to fans who have been asked to wait in line beginning at 6:00 a.m. the morning of the show.