You can upload your music into pagebuildr by selecting "My Music" under "Page Type."
When you would like to add a song to your music page, first you create the music page. Next, go to that page under "Manage Pages" in your build menu. You will see this image in the bottom right corner of that page:
Click on the little green cross to add a song to the page. Then, you will be brought to this screen:
Sound File: Click "Browse to go to the file manager and upload a new mp3.
Song Title: Enter the name of your song in this box
Artist: Enter the name of the artist who authored the song in this box
Album: Enter the title of the Album that this song is on here.
Album Cover: Click browse to go to the File Manager and upload an image that will be displayed with your tunes.
Link: Provide a link to another website that this song may be on or your band website.
Display Order: This will choose which order the the song is displayed.
Song Description: If you would like to write a note about the song, enter it into the word box.
After you click submit, the song will be added to your page. Your file will automatically be put into the "sounds" folder in the File Manager, although all files are displayed when selecting a file for use.