I am glad to find so much useful (and a little overboard) information here and other threads, since I just picked up the bass in September. Actually it was given to me by the guitar player since I refused to try to squeeze my keyboard in a 9x11 bedroom with guitar, amps, pa, drums and few dressers! You can't turn around without knocking something over. When I accidentally hit a cymbal with my bass, the drummer said, "You play the bass, I'll play the drums!" It's funny but we need a bigger space. Also, I have all the gear needed to record, mix and master, so my importance in the band is pretty high. (Glad to know that!) We currently do all original tunes and do not plan to do covers. However, someone here suggested it might help getting gigs.
I've just put together some CDs of our tunes, one without drums for the drummer and one without guitar and one without lead for the guitar player so we can get over that "not practicing" during the week. If you've got the gear this can be a great help. And that way the songs are played the same way every time.
We are all real good friends so when we get together usually we do more hanging out, getting drunk, doing drugs (nothing H-core don't worry!), than actually getting down to business and writing structural compelling songs.
Don't get me wrong, our improv jams rock the house, its just the matter of getting down to business and getting serious about creating a band and music together. We are all on the same generall wavelength in terms of musical interests and where we want to take the band.
My comment here would be, Do you record what you play and listen to it when you are sober? I try to record every session we do, with the intention of eventually getting good enough takes to make a professional CD, but also to listen to what needs to be fixed. The other band members will often say, "What a great practice" or "great take", but then when we listen to it, it's like "That's screwed" or "we weren't together there".
Also, I currently tend to have a beer always at my elbow during practice because I can drink quite a lot without noticeable effects, but that is not the case for the guitar player. After one, maybe two drinks, he is showing all the signs of an alcohol/sugar rush and starts playing more enthusiastically but with less technique and shouts more of the lyrics than sings, and then within 30 minutes or so starts playing slower and slower due to the sugar crash. He is finally starting to realize what is happening, since it's affecting the productivity of our practices, and I may even offer not to drink myself for at least the first few hours so we can get some work done. Rather than a "no drinking" rule, adapt it. And as far as drugs, like alcohol, your playing can sound great to you (because what you imagine in your head) but listen to it sober and you might change your jam session habits.
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I hope to be a good bass player one day.