mozart (off-topic)

[Heschel3 <Heschel3...>]

i'm trying to find out the opus number to a mozart piece i heard the other 
night.  it was a violin sonata in b flat performed by itzhak perlman and 
daniel barenboim.  any ideas?  also, has anyone heard the very first 
recording by jascha heifetz recorded in 1911 when he was 10 (?).  i'm 
wondering if it's worth trying to hunt down.  peace...  --j.

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