If listening to music is too exciting for you, especially rock-and-roll, you may enjoy listening to a metronome.
Click here to listen to online. you can listen to various speed and choose the one that suits you best. On this metronome, the speeds indicated are largo, larghetto, adagio, andante, moderato, allegro, presto, prestissimo.
Ramping it up
Click here to see and hear a YouTube video of 100 metronomes.