electric.. hehe.. I either get a sticky nut groove (that just sounds wrong out of context :D ) or the G string is constantly out of tune, meaning I have to tune after virtually every song. Or even after taking to a tech to fix intonation, the intonation is still way out.. none of the other strings have these problems.. except on rare occasions when I do something wrong, like set the bridge saddles too low in an attempt to decrease the action. The guitar tech I took it to is well known in my area as being honest and good at what they do, and I have been going to him for about 10 years. If it was just one guitar doing it, I would say it is the guitar.. but my 6 month old strat-copy does similar things in regards to being out of tune all the time on the G-string.