Some additional functionality I was not aware of until I saw it mentioned on reddit; with version 9 you can now slide your finger up and down on the music icon in the dock to expand or collapse the music menu. This works the same way as adjusting the temperature in version 9 by sliding your finger to the left or right of the current temperature. It’s a nice little improvement and does make resizing the music menu much easier while driving.
you can also tap the album art. that has been around for a while, though.