Two Limericks I Wrote!

Two limericks for two friends:

There once was a Professor,
Who everyone called Vasudev Sir,
His dear friend was one Yamashita,
Who was trying to learn the Sitar,
Alas, Yamashita was tone deaf, oh Dear!

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There once was a guy named Ravi,
Though good friends he had a bevy,
But baffling him was friend Yamashita,
To him only was invisible in Tea Center,
For, of this mate's identity he wasn't privy.