I like my 12 string Alvarez for bluegrass and country-tinged stuff, where it has some of the flavor of mandolin and dulcimer mixed in. I also like it in any song that has a "baroque" or "medieval" tone, ie John Riley, Wild Mountain Thyme and even the old Stones tune Lady Jane. I'm playing on and off with Mason Williams' Classical Gas and I love the ringing harmonic the 12 gives the minor chords in it. Any Byrds, Beatles, mid-60s folk rock is great for it (McGuinn rules!), and any retro-folk like REM or Live.