I sing, don't play guitar. And I play tin whistle.

Singing: 250+ song memorized, 600 or so that I can sing with lyrics in front of me well enough not to embarass myself on stage.

Whistle: 30 or so I can play well enough. I've only been playing for 4 years or so. Not much for practicing.

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And I remember in college my humanities profs saying the age of bards has long past. I could safely sing for over 8 hours without anything more than a list of songs to remind me which ones I have memorized. Oddly enough my phone number is the only one I know by heart.