HTC DROID Incredible - Manual (Page 239)

Music 9
Press the VOLUME UP or VOLUME DOWN button to adjust the
playback volume.
If you are using the wired headset to listen to music, press the center
button to toggle between playing and pausing playback. Press the
previous or next button to go to the previous or next song.
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Browsing music in the Library
Tap at the bottom-left corner of the Music application’s Playback
screen or Now playing list to go to the Library.
In the Library, your music is organized into different categories such as
Albums, Artists, Genres, Composers, and more. Select a category by
tapping one of the category tabs at the bottom of the screen.
When you tap a song in a category to play it, the Now playing list is
updated with the song list from your selected category.