There are several artists with this name or similar names:

1) There is a G5 Music label which has uploaded an EP of a hip hip artist on Last.fm. Probably this is the same as the G5 Music page on Facebook, see sources.

2) G5 the Jett is a hip hop artist from Oakland.

3) G5 Clive is a hip hop artist from Washington.

4) The G5 Project is a Japanese band.

5) For the Spanish flamenco group see G-5. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.