Songdrop is web service that acts as a music aggregator.
It allows you to add songs to groups, which the service calls mixes, from any website. In addition to creating your own mixes, you can search other users’ mixes too and if you like the songs they have, you can drop them into your own collection.
The service also has a dedicated Chrome extension, while users of other browsers can use the service’s bookmarklet to add songs.
From official website:
"With Songdrop you can make playlists with songs from YouTube, Soundcloud, Vevo and blogs, so you can keep track of the songs and music videos you discover, as you discover them.
The whole internet is your record collection, and we're your online record player.
You can create mixes with songs from all different websites like YouTube, Soundcloud, Vevo, Pitchfork and lots more by using our DropIt button..."