my band, for which I play guitar and a little bit of percussion and do all the singing, opened up for two other, much better established local bands in their warehouse/practice space. We'd gotten together less than a month before. The other three guys in my band were lead guitar, bass, and drums (not too original, but it does the job.)
We did the usual soundcheck stuff, and about 35 people showed up, which was more than we could have asked for. We opened up with a song that the other guitarist wrote most of the music to, and I had written the lyrics, then played 7 more songs--half covers, half original. At the end of one original song, I kept on playing a bit after I was supposed to because I could not hear Joe, the other guitar, who was too low in the moniter. I looked up at Joe, who had the "Oh, crap, we messed up" look on his face (which I probably had too) when all of a sudden, he started playing again and we just jammed. After the show, we found out that no one knew that wasn't supposed to happen. We closed with LA Woman, which definately rocked the house.
We decided to scrap two songs from our catalog after the show. The first was an original that just didn't work--it had started with a great chord progression for the chorus but had just gone bad as we tried to take it in too many different directions (and I had never been happy with the lyrics I wrote). The second was that song "Are You Gonna Be my Girl" by Jet, because we had all gotten so sick of it that no one in the band can listen to it anymore. We got to play two more shows before the end of the college semester, and saw how much we'd improved each time. Our drummer just graduated and moved back to New York, so we plan on picking up a new one and keeping the music alive in September.
PS--all you lead singers--don't scream your voice out in the middle of a show. Our third show we did LA Woman in the middle, and I screamed a bit too much from "Mr. Mojo Risin'" until the end, and could barely sing for the rest of the set. Luckily almost no one was there.