I might be wrong, but I doubt it! Kinda noticed that the Yoruba language is the most spoken language in Nigeria and abroad besides English lang. Don't know the population of this tribe, but boy, they're every where!
Even the Nollywood Igbo superstars tend to speak this language too. Saw some of them in some Yoruba movies; they're very fluent in speaking it. Back in London and the USA, their govts are proposing introducing this language to their syllabuses.
Again, I noticed that any Nigerian Artists that does'nt include Yoruba in the lyrics of their songs is like an accident waiting to happen. Although Timaya's got his own style, he's beginning to see why he must atleast put some of the Yoruba lyrics in his song.