Rather than sending your friends awesome songs you just discovered via text message, why not have it all within Spotify? The group chat feature allows users to send a song to multiple friends. Your friends have the ability to respond via chat, "I Love This!!", listen to the song and even save the song...all WITHIN this chat feature. Chat history allows users to go back at any point and check out the songs their friends have sent them.
Hey and thanks for your contribution!
A similar idea has also been suggested here
Add your vote and comments in support there please : )