Haunting me for weeks... (Need help identifying a piece)

[mig103]

Hello,

I've been looking for the composer/name of the piece attached for some time now. I hear it frequently as an interstitial background on KUSC (local classical music station.) My friend ventured a guess that it may be something that Carl Maria von Weber may have written - so far no luck.

Thanks in advance! (I apologize for how short the clip is... I'll try to get a longer segment.)

[mig103]

I just popped off an email to the radio station too.

[richard black]

Mozart, sonata for 2 pianos.

[mig103]

Yes! That's it - thank you good sir.