Though not officially announced, it was just poped through a press relase on Zune that Zune Market place is 3 Million songs for purchase. Originally it states as follows: "

Zune is Microsoft’s music and entertainment platform that provides an end-to-end solution for Connected Entertainment. The Zune experience includes a 30GB digital media player, the Zune Marketplace music service, and a foundation for an online community that enables music fans to discover new music. Zune Marketplace offers for purchase more than 3 million song titles, ranging from popular hits to leading-edge new music. Zune users can download songs individually or by the album using Microsoft® Points or a Zune Pass subscription, which offers unlimited downloads for $14.99 a month. Zune Marketplace also offers insightful editorial programming produced by a team of music professionals who aim to bring a local record store experience to the digital world. Zune is part of Microsoft’s Entertainment and Devices Division and supports the company’s software-based services vision to help drive innovation in the digital entertainment space. More information can be found online at http://www.zune.net/en-us/press."