If you want to embed an MP3 audio file into a Blogger post, you can insert your HTML code for the music player. If you have an MP3 file on your computer, you can upload the song to obtain a direct URL ...

The SCM Music Player is a free music player with playback controls and a playlist that you can add to your Tumblr blog or any other website. The SCM Music Player appears at the top of your Tumblr blog ...