?Girlfriends
Probably the most common forum of evolution is when all the guys who start the band start getting girlfriends. Some guys handle this just fine and keep the band first (like it should be !!! har har). Other guys get magically whisked away to fairy tale princess land and forget about their bills, their problems and their life, because all they want to do is think about their girlfriend.

Well, unfortunately, when a guy falls into this spell, there isn't a whole lot you can do to stop it. Basically, the dude is a lost cause. Just watch Anchorman and you'll see how this results. (Baxter saves Ron and Veronica from the bears).

From a band perspective, it's very important that you become friends with the girlfriend. Why? Because if she actually likes hanging out with the band, your love crazed band member will actually show up to practice, gigs, parties.

Also, if you can get in good with the new girlfriend, she may have friends of her own that need some attention. Not that you want a girlfriend, but you may be able to think of some fun you can have. If nothing else, by bringing over the girlfriend's friends, you'll make the hotter chicks at the party more jealous and increase their “fun” factor.

The Great Band Double Standard
I've noticed a tremendous double standard with bands who have been around for a while. I even experienced this first hand. When you've been jamming with the same guys for a long time, you get a little bitchy. You say, “Awwww. I don't want to play THAT song again!!!”. You find yourself complaining. Well, let's just say you decide to go jam with some other guys. You are all excited because it's WAY different, new, and exciting playing in a different place with difference people with different chicks around. Then one guy starts playing the riff to that same exact song you were complaining about to your other band. Almost every person I've ever seen will happily play the song without putting much thought into it. Why?

Well, lets think about this. The overwhelming difference between playing the same exact song with two different bands has probably nothing to do with music at all. (I'm making the assumption that both bands are of equal talent in this case). I really don't think that simply playing the same song in a different room is that big of deal either.

I think the difference is in the person smiling for playing a song that he usually complains about it. Think about it. When he's with his old band, he's not willing to compromise and he is being a little bit stand off-ish. There are probably reasons other than the actual song as to why he is unhappy with his old band that aren't being mentioned. For example, maybe he isn't unhappy with the song, but unhappy with the reason they are playing the same song....AGAIN! Maybe he wants to get out and play shows, for example.

Now let's go back to the new jam session with different guys. Our guy is willing to compromise. He could throw a fit (like he would with his old band) but he doesn't want to look like an idiot in front of the new band. He's willing to compromise in order to make the jam session (and maybe future opportunities) work). He's open for communication and willing to solve any problems. If a guy says, “Hey man, you are a little loud, can you turn you amp down?”, he'll probably say “Sure! No problem.”. Would he act that same way with his old band?

This is a flaw of human psychology. We all deal with it from time to time. Making sure that everyone is aware of this flaw in humanity may improve relations within the band.