As an old school comic book nerd (I always joke I was a comic book geek back when it was shameful :) ) Len was a huge part of my fandom and I was very sad when he passed. I wish I'd known he was a musical fan too - I love talking musicals with guests at any kind of con!
(Of note, Freddy Krueger himself, Robert Englund is a big musical fan - especially of 'Company.')