Amazon (AMZN) is the latest company rumored to be prepping a subscription music service, according to The Verge. Although the streaming music business has not yet proven to be all that profitable, a number of companies have expressed interest in joining a growing field of services. Amazon already offers a robust music store with features such as cloud music storage and a Cloud Player, however the company has reportedly reached out to various music companies about the idea of starting an “on-demand” subscription music service similar to Spotify. Earlier reports have indicated that Apple (AAPL) and Google (GOOG) are also in talks with record labels to launch competing music streaming services.