The Music Timer

Music Timer allows you to keep track of time while seamlessly listening to music. All you have to do is select a playlist, set a time limit, and let Music Timer find songs whose run times add up to within 10 seconds of the time limit without ever going over.
Music Timer uses any user playlist that is available in the Music app on your iPhone. It's simple to use and useful in many ways!

Example Use:
You want to spend 30 minutes getting ready and want to listen to music. You open up the app, select your favorite playlist, set the timer to 30 minutes, and click play. Music Timer finds the exact amount of songs to play for 30 minutes and lets you know how many songs there are. Now you can get ready, listen to music, and know you won't be late.