Tupac is the most requested artist on prison radio in the UK.

The National Prison Radio, which broadcasts to jails throughout Britain, have released a list of the acts inmates have asked to hear the most during 2012.

Following rapper Tupac on the list is Vybz Kartel and K Koke, whilst US star Rihanna charts at No.4.

Other notable names on list include Drake and Akon at No.5 and No.6 respectively, whilst rockers Metallica are in at No.7.

Slipknot continue the metal theme at No.12, although the inclusion of Pink Floyd and Bob Marley in the top 20 suggests prisoners are also keen to hear laid back music too.

The full list is as follows:

1. Tupac
2. Vybz Kartel
3. K Koke
4. Rihanna
5. Drake
6. Akon
7. Metallica
8. Pink Floyd
9. Biggie Smalls
10. Gyptian
11. Jah Cure
12. Slipknot
13. UB40
14. Bob Marley
15. Lil Wayne
16. Eminem
17. Evanescence
18. Mavado
19. Devlin
20. Giggs