Hi! I've been reading all the various replies and getting a lot of insight into the matter. If I haven't responded to you, it's mainly because I was digesting what you said and didn't think I needed to engage a certain point in discussion. It was mainly to gather data and responses, and I think I'm getting a much clearer picture into what goes on in people's minds. It seems that most people are cool with the idea that recording can be a different process from live, but that everyone needs to be above board about the whole thing, and that there shouldn't be surprises.
This is a point I wanted to discuss in detail. I'm not entirely sure it's realistic for the live arrangement of every song to reflect what the platonic ideal for a song should be. Some songs are recorded before they are performed, and some songs are performed before they are recorded. Sometimes, songs have a certain live energy that just really work on a recording, and you can just hit record and it's perfect. But sometimes, the live version just loses something with out the visual aspect of the show, and you need to be more subtle with it. Not only that, but there are logistical issues, too. If a singer is also playing an instrument live, there might be some complex things that are really tough to sing and play at the same time, but in a recording, that's not really an issue. And sometimes, you just don't have enough hands on deck. And sometimes, you might have a song that really just needs to be a soft, solo acoustic recorded ballad, but you just can't do that live, so you work out a live version that doesn't have people leave the dance floor.
The opposite can happen, too. Sometimes, a song that was made in the studio really comes to life when it gets taken on the road and it develops a whole new aspect of it that was missing in the recording. I was watching some live footage of Radiohead the other day when I noticed just how crazy good the live versions of Kid A songs are. I love the album, and I love the songs the way they are recorded, but man, the live versions are so different yet equally good in different ways.
I guess this is where I feel that people really benefit from learning music, not from learning parts. I've met musicians who just care about how to play a song and don't care how that fits into the song. If you know your scales, your chords, and you understand that your parts are just one of the many things that can be done within the framework of the song, then you'll be able to adapt to a new situation. But if you really get married to playing a certain part and you don't think about how it fits into the song, then you can't adapt. You don't necessarily have to learn advanced theory to be able to learn music at a deeper level, but it certainly helps to at least know basics. Like, I feel like, if you're a bass player, you should know, at the very least, what chord is playing on each part of the song, and how that relates to what you're playing.
I've seen some extreme examples of this. As a bass player, I worked with a drummer who was in a band with a singer/songwriter/guitarist and there was a really brilliant, beautiful song that was recorded as a solo guitar + vocal ballad. Then they wanted to do a live version of that song. It was obvious to anybody in the room how it needed to happen. Bass plays a few quiet notes, maybe a couple slow arpeggios, and the drums should mostly stay out of the way and then put a little something on the choruses. But this drummer couldn't get over the fact that this certain arrangement of the song didn't fit the awesome drum beat that had been made up when the song was initially being written. I didn't say it, but every fiber in me was like, "Who cares? This recorded version is really great! It's not about you or your amazing drum beat that you made up. It's a ****ing soft ballad now, just hit your ride cymbal and shut up." Of course, I was just the bass player, so I didn't say anything, but people like that, who seem to care more about what they're playing and how they're playing, rather than what the song needs and requires, really bug me. We didn't even end up playing that song, and it's a shame, it was easily one of the best songs on the album. And all because of the drummer. Drums are not even a melodic instrument, not like we changed the key on you. No wonder the song was recorded without the drummer being around, the song would have been worse with the drummer. If you can't be at least THAT flexible, you'd better be the writer, because otherwise, you're replaceable. And yes, the drummer has been judged since to be replaceable, though the actual replacement hasn't happened yet.