Ghanaian-born, east London-based "grime" artist Tinchy Stryder scored his first U.K. No. 1 single yesterday, debuting at the top with the aptly-titled "Number 1" (4th & Broadway/Universal Island), featuring London hip-hop act N-Dubz. Lady Gaga's "The Fame" (Interscope/Universal) tops the album chart for a fourth week.
![Don't Upset the Rhythm [Go Baby Go]](http://www.billboard.com/files/styles/thumbnail_140/public/songs/d/162649320.jpg)
