Gavin is the presenter for App Lab for O2 Guru TV, which is the YouTube channel for O2 featuring online shows about technology. In each themed episode, Gavin reviews a range of different Apps which you can download on to your smartphone.
Gavin takes a look at the new O2 Tracks app, a service that allows you to have the current Top 40 on your phone at all times, whether you're an O2 customer or not.
Inspired by the app, Gavin has a go at making his own hit record...