25 GB is what you get with Apple’s iCloud, Amazon, and Google. Microsoft is pushing beyond, making it unlimited for photos and documents - and if you have a Zune pass (their streaming music solution) then you get unlimited music as well.
Google music is 20.000 tracks, not 25gbs. That’s roughly 250gb for me, more as I convert whole albums into single files. Fantastic for those storing audio books. By the way, mail me if anyone wants an invite. Got seven extras.