Interesting little bit about Mendelssohn over at NPR in honor of his 200th birthday. Apparently, there is a 2nd version of his 4th Symphony! I'd love to hear it, but haven't been able to find it in my interwebs searchings. I think they exaggerate how big of an impact Wagner had in slandering Mendelssohn out of the canon, but it's worth mentioning how big of a douche-bag Anti-Semite Wagner was.
In my opinion, Mendelssohn is a bit underappreciated, so it was nice to hear the story. Here's the 1st movement from his 4th Symphony... enjoy!