This app was removed from the App Store.
Mac OS Utilities
Countdown is a configurable countdown timer with extra features especially designed for having fun while the timer is running.
It is possible to define a background music list to play during the countdown action. It is also possible to configure periodical alarms to let you know how much time left, and you can control the volume of the background music and alarms individually.
The application has specific sounds in Spanish and English for periodical alarms (up to 10 minutes). This option can also be disabled and use apple sounds (Glass and Purr) instead.
It is also possible to define profiles to save the background music list and countdown timer settings to use later in other executions of the application.
I use this application every day to do my exercises having a good time listening to good music and knowing how much time left to finish them.