Files themselves are limited to 300 MB, and if Google has to convert a file, that limit applies to the converted track. There is a size limit, but that only really matters if you’re uploading very high quality music. The standard service is free and lets you upload up to 20,000 tracks. If you have a Google account and want to use Google Play Music, head over to Google Play Music. If you already have a Google account, Google Play Music is an excellent service that costs nothing up front. What’s important to know is that Google Play Music isn’t Spotify, and it isn’t Pandora it’s a mixture between listening to your own music, and discovering related music.