I used to play live bass for a singer song writer who wrote and recorded his whole albums himself, all played to a high standard, the live shows sometimes had 3 guitarists or just him on guitar, sometimes acoustic sometimes electric, sometimes we had a drummer sometimes we didn't and it would be a cajon player instead, sometimes we had the female singer that did the studio session if she was around, if not Dave sang his version. It's all good, he has a whole new lineup these days and the songs still work because they are great songs.
If anything I go and see bands live to hear the songs played differently to the cd, I'm going to see a band on friday where the core member is an epic banjo player but you never know what you'll get until the night, I've seen him with a harpist,cellist,violinist, guitarist,bassist,drummer,percussionist and upright bass so far in various formations of no more than 5 players normally 4. Always good but never the same twice, that's live music for me