The market for cloud-based music remains early, though Rhapsody is jousting aggressively. Ahead of serious stateside entries from both MOG and Spotify, Rhapsody has now layered cached content into its iPhone, iPod touch, and iPad offering. The feature is a major selling point for Spotify’s iPhone app in Europe, and allows users to access large collections while out-of-range.

Suddenly, the cloud can fill in the gaps. “Today marks a turning point for Rhapsody and subscription music,” said Jon Irwin, Rhapsody’s president, pointing to the Monday morning announcement. The offering is available for $10-a-month for one mobile device. Shifting to $15 allows access across three mobile devices