The Gunners midfielder has been linked with the Catalan side this week, and the winger, who was once on the books of Portsmouth, has hailed Song's abilities.
"Song is very good. [He] plays more as a defensive midfielder but can also play in the centre. He has lots of character, [is] very strong and is a leader on the pitch," the 25-year-old told COM Radio.
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"He is very nice, very outgoing, a very good companion. He is a good person. [He] would fit in without a problem [at Barcelona].
"He is like [Javier] Mascherano but a little more offensive. He is versatile, and can play multiple positions. And I guess that Tito Vilanova and the technical director view that as a positive."
Several players have moved between the clubs in recent seasons with Alex Hleb, Thierry Henry and Cesc Fabregas all switching to La Liga from the Gunners.