Google Play is an online storage of MP3s that allows you to listen to your library almost anywhere. It allows seamless sync with your android device or iphone device just like iTunes. Thus freeing up valuable space for other stuffs on your mobile device. Sadly Google play is only available in the US.
If you have tried uploading MP3 albums from your PC to your Google play account, often times you would notice that some albums are split. Basically, some of the tracks are grouped into one album and the other tracks into another with the same album cover. It will then show two albums with the split tracks inside. This usually happens when there are inconsistencies in the tacks ID3 tags, specifically the Album Artist field. To solve this, you could go on and edit each track to remove or to add the Album artist making consistent throughout the album. You may find that you could edit multiple tracks at once by selecting them using SHIFT CLICK combination. Then clicking the triangle at the end of the cell in the song title field selecting “edit info for selected songs”.
Another option would be is to just make sure you are uploading the correct ID3 tags. The older versions of the Microsoft Media player allows you to edit them but I can no longer find this option with the newer versions. What I usually do is download a 3rd party tool to edit the ID3 tags. I found that Media Monkey is the best application for editing ID3 tags.
While at it you may want to try out Music Plus for Google Music an extension that lets you scrobble song to your Last.fm account. Use the Google Music Manager to upload and download you MP3s including the ones you bought at the android store. The only problem I found using the application is that sometimes tracks will fail to upload and if you are uploading hundreds of files it will be hard to track and the application does not provide any option to retry the failed upload.