which cover versions does this above first popular work of his have?
The one by Jamie Cullum.
Frontin'
On February 11, 2004, the track was covered by British neo-jazz artist Jamie Cullum for BBC Radio 1's "Live Lounge". 
pharrell gwen can i have it like that It is a song. who is the singer? Pharrell Williams is he the composer also? Yes. how good or bad did it perform on the charts? It debuted at number 97 on the "Billboard" Hot 100 and peaked at number 49 three weeks later. where is the singer from? Virginia Beach, Virginia. can you name any other popular works of his? "Frontin", "In My Mind" and "Happy". does he comprise of international stardom? His "Blurred Lines" peaked at number one in multiple countries.
wiki:8906488
Frontin' [SEP] Covers
On February 11, 2004, the track was covered by British neo-jazz artist Jamie Cullum for BBC Radio 1's "Live Lounge". Williams was very impressed by the cover after it was played to him on a visit to the show, and this led to Cullum providing backup vocals for "You Can Do It Too", a track on Pharrell's first solo album "In My Mind". The cover appeared as a bonus track on the US release of Cullum's album "Twentysomething". Cullum's version was released as a single and reached number 12 in the UK. It was also covered live by Maroon 5, featuring Chad Hugo and rapper Mos Def, who replaced Jay-Z's verse with impromptu rapping from A Tribe Called Quest's "Bonita Applebum," in an apparent reference to similarities between parts of the tracks.