how many guitarists does it change a lightbulb?
NONE.
Because everyone will be busy suggesting bootique lightbulb they just bought because of the hype they read over the internet (well some don't even tried it at all). You will hear like:
Guitarist A: My lightbulb is very organic! And it's very warm!
Guitarist B: Ah, mine is best lah! it can speak to my command!
Guitarist C: Mine best lah, very transparent light! Doesn't color my sight.
Guitarist D: Mine pwned yours all! Dunno what it does, all I know it cost my wallet USD599.
And some other will be busy suggesting the best and the costliest technician to be engaged to change the lightbulb too. You will hear like:
Guitarist A: Go with Technician X! His work is superb, any lightbulb after serviced by him will shine like never before!
Guitarist B: That X guy is overrated lah! Go with Y! Half the cost, but gets the job done.