LIMITED SEATED SHOW WITHOUT RESERVED BOOTH EXPECT TO STAND. - The four principal members of Austin’s The Trishas would have you believe that they’re not blood related. But a DNA test might be in order. True, their individual bios may support their claims of having all had separate lives before meeting each other; but to hear them sing together, you’d swear they were harmonizing from the womb. Then again, sometimes luck and fate sing in perfect harmony, too, and uncontested magic just happens " just as it did the very first time Jamie Wilson, Kelley Mickwee, Liz Foster and Savannah Welch ever shared a stage together. It was ostensibly supposed to be a one-off gig " two songs as part of a tribute to Savannah’s father, famed songwriter Kevin Welch, at the 2009 MusicFest in Steamboat Springs, Colo. But midway through their first practice, it became clear to all in the room that they were on to something good. Goosebumps don’t lie. “I remember we were at Kevin’s house, working up one of his songs " I think it was ‘Satan’s Paradise’ " when I first heard it,” Wilson recalls. “We were going over the song, figuring out our parts and everything, and we tried it and didn’t hit it, tried it again and didn’t hit it … until one time, finally, we actually got it, and I thought, ‘Cool!’ And then we worked up the whole song, and all of us were like, ‘You know, this is actually pretty good. We’re actually going to be pretty good " if we can pull this off.’”