I am not in anyway affiliated with GS/Escape and have 0 influence on their operations, but given what I know of them and that it only replicates what several other API libs provide, this DMCA seems really odd or a mistake?
From someone elses comment, looked at the google cache of your github repo,
.url is a part of the meta info from the api - there is no downloading functionality in the api library itself. The song url is just the culmination of the song id and your session
From someone elses comment, looked at the google cache of your github repo,
> groovr.getSongFile songs[0].SongID, (err, file) ->
might have been the part they have a problem with?