The Vodafone Big Top 40 Show

Officially the UKs most listened to chart show... The Vodafone Big Top 40 Show

It's the only chart on the radio that you can directly change by downloading the songs that you love most, from iTunes.

That means the Top 10 songs will move position in the live countdown, according to how much you like them!

Rich and Kat, your hosts, will have all the stars popping in to make sure their songs reach the top of the chart.

The Vodafone Big Top 40 Show is the chart you can change! Every Sunday from 4-7pm