I think people with a "good ear" are often self-taught because, well, they can--that's what having a "good ear" means. They take more naturally to it, hear the notes, feel the groove. That doesn't mean they wouldn't benefit from appropriate "lessons", but they can accomplish much without them.
I'm self-taught, in that when I picked-up the electric bass there weren't any electric bass teachers around. I used a guitar book to figure out tuning, etc.
But the reality is that no one is completely self-taught, not if you ever play out with other real musicians. Believe me, I've been given a lesson by a drummer or guitar player right in the middle of a song! That's the best lesson: learning what you can from other accomplished musicians, and depending on the genre, you might need to know some of their language, which varies from, say, jazz to rock, where you might need more formal training to converse with the former more so than the latter.
I'm self-taught, in that when I picked-up the electric bass there weren't any electric bass teachers around. I used a guitar book to figure out tuning, etc.
But the reality is that no one is completely self-taught, not if you ever play out with other real musicians. Believe me, I've been given a lesson by a drummer or guitar player right in the middle of a song! That's the best lesson: learning what you can from other accomplished musicians, and depending on the genre, you might need to know some of their language, which varies from, say, jazz to rock, where you might need more formal training to converse with the former more so than the latter.