My condolences to the Krug family.  Dave was my first music teacher 32 years ago in 4th grade at Park Elementary.  My favorite memory of him was when he would un-stick my trumpet mouthpiece from my trumpet after I banged on it too hard.  He had to do it three times.  He'd give me this look as though to say "Again?". And I'd sheepishly thank him every time.  (4th grade, okay?)