Yes keberoxu, they are two different persons, the German composer Carl Friedrich Zelter (1758-1832) and the Asutrian composer Carl Zeller (1842-1898). Thanks to Wikipedia; I didn't know of the second until now.

I didn't know 'etwann' either, and it isn't listed in my Duden (dictionary). It lists 'etwelche' though, which it says to be outfashioned for some, a few.

I also was stymied by 'Dinte' until I realised that it is an old spelling for 'Tinte', ink.