I heard several Blue Jays in the woods behind the house today, stirred up over something, with excited "queedle queedle" calls etc. Nothing unusual or noteworthy, but one kept repeating a musical phrase, in what sounded like perfect pitch: A flat (below middle C) to F, a minor 3rd interval. Its durations were regular for a short time also: A flat for a quarter note's time, followed by a 3-quarter note F. So in the key of F minor. If it had repeated the phrases in regular rhythm I would have been astounded, but the phrases were random and mixed up with the other jays' chatter. My guess is it overheard someone playing monotonous loud music; that type of interval is frequent in hip hop. Too late getting my phone but I'll be listening for this bird to try to get a recording.
The only other really talented mimics of this caliber I've heard before were a Starling imitating a car engine attempting to start, and one that imitated my former neighbor's always-the-same calling to her dog, "Max, Max".
Sean Smith