LoL music on Spotify

Will you guys ever put all the champion music and other songs on Spotify? I reckon you would got a lot of listeners, the Braum one is on there but no others, be epic to get them all! Such as bilgewater, dragon trainer trist etc...

I know you have them on YouTube and soundcloud, and certain songs on Spotify such as the worlds songs, so just wondering why not all music on Spotify? Would be good to be able to download the music of league and listen to it on the go.