Barcelona have completed the signing of midfielder Alex Song from Arsenal on a five-year deal for an undisclosed fee.
Song came through a medical with the Primera Liga giants earlier on Monday and the deal is now done, with both clubs confirming the news.
Barca said via their official Twitter account on Monday afternoon: "Alex Song has signed his contract with #FCBarcelona."
The Gunners also confirmed the deal, which sees Song end a seven-year association with the North London club.
A statement on the club's official website said: "Everyone at Arsenal would like to thank Alex for his contribution to the club and wish him the best of luck for the future."
Song arrived at Arsenal in 2005 from French side SC Bastia, initially on loan, and his move was made permanent a year later as he joined for just £1million.
The Cameroon international went on to establish himself as a key member of Arsene Wenger's side, notching up a total of 204 appearances for the Gunners.
He becomes the second big name to depart Emirates Stadium this summer after captain Robin van Persie left for Manchester United.
After being officially unveiled on Monday evening, Song told Barca TV: "Today is a very good day for me and my family. Very happy to be here, this is the best team in the world, playing at a club like Barca is something I wanted when I was young.
"I hope the team will continue to win, this is a winning team. They win everything. I will give my best in training and when I get the chance to play I will do it."