Are you Looking to send an music file to a person which will enable him to listen over the phone? If so the quickest and easest way is to use your handset and play the music file via your sound card, with your speakers near the phone. If you try to send a file via your modem to a handset all the other person will hear will be the Beeps and Squeaks of modem talk.
Only the insane prosper.
Only those who prosper can judge what is sane.