东一榔头，西一棒子

(Special thanks to LM)

Again, I have got recently a musical "finding", though which must not be anything new for people trained with the academic background.

In Heidelberg I listened to Mozart's G minor piano quartet (K. 478) for the first time, and in the third movement (in G major), suddenly there came out a theme which is identical to his famous Rondo in D major (K. 485):

So I searched for the composition background, which confirmed the relation between them: Mozart composed the commissioned piano quartet first (1785) and in the first days of 1786 he used the 2nd theme of the 3rd movement to develop a lovely rondo for piano solo:

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Actually I had another similar experience with Beethoven, one year ago. Also in one of his piano quartets (from WoO 36 No. 3 - 1st mov.):

I got to know this phrase thanks to the documentary "Bloody Daughter": Here in the excerpt M. Argerich was playing with her elder child Lyda Chen, among others, where I heard a same passage as the one that appears in Beethoven's 3rd piano sonata (Op. 2 No. 3), also in C major.

Later when reading complete scores of the quartet, I saw more evident similarities in the first movements of the two works...

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It was not any coincidence. It was because that I did not listen to PIANO QUARTETS. Yeah, piano trios, piano quintets, string quartets... but never paid attention to piano quartets. 

Interesting.

And, every day a little less ignorant... : )