Efron tells the Los Angeles Times, "She's a great teacher. In the past, everyone who has tried to teach me guitar starts with music theory and stuff like that.
"I tend to just doze off after a little while. She went straight into songs. She taught me, like, four chords, and I'm already playing all the good campfire songs."
Efron showed off his skills by playing guitar and singing with his mentor Swift during a taping of The Ellen DeGeneres Show, which airs on Tuesday (21Feb12).