Peanuts by Charles Schulz for April 23, 1953
Transcript:
Schroeder sits at the piano playing.<BR><BR> Charlie Brown approaches holding a small violin. He asks, "Look, Schroeder...a toy violin! Do you think you could play a little Beethoven on it?"<BR><BR> Schroeder replies, "Beethoven?! On a toy violin?!!"<BR><BR> He resumes playing on his toy piano and concludes, "How do you expect a person to play Beethoven on a toy violin?!"<BR><BR>
In Li’l Folks, Schroeder actually played Beethoven on violin. Except that gag was also reused for Charlie brown.
https://peanuts.fandom.com/wiki/Li%27l_Folks,_March_1949_comic_strips?file=LF-3-6-1949.jpg
https://www.gocomics.com/peanuts/1951/02/16