i accidentaly heard Koishsi's theme in one video and started searching for source... cound't fing it for a while, but after i did, i started listening to touhou music and figured out that many of my favorite songs wich i were listening to were just touhou remixes. and some time after i tried playing (actually started with touhou 11 because of koishi's theme. i got 1cc normal after a month of playing). so that's how i got into touhou!
(sorry, my english might not be perfect because i am from russia, i am still studying language)