Maybe the best singer in rock. I'm not very focused on lyrics (but stupidly bought that big expensive book and haven't looked at it once), but how they are sung -- melody, vibrato, phrasing, inflections, and I thought Jim was great at that. The timing. The Doors were THE band to get me into the music I like decades later (thanks to the guy in Science class in middle school who is now a millionaire)
1967-1971 - such a short time, but leaving us so much great stuff. I also found Jim Morrison to be one of the funniest guys. There's some parts in concerts that got me to laugh out loud. Studio banter, etc.