I am a musician as well and have found that my benzo habit affects my performance. I might feel better if I'm on it, but the music suffers a bit, because I'm too comfortable, if that makes any sense to you? I actually try to delay the dose if I'm recording or playing somewhere, or at least try to take less.
I fear that if you take Lorazepam everyday all of a sudden out of the blue like that, you might feel great(or just dull) and think everything went well, but realize later that your playing was not nearly what it could have been. Benzos are subtle that way, at least for me.
A little anxiety can be a good thing in making music, you don't want to feel emotionally dead. Others have articulated better than me that moderation should be the way to go. Someone in particular made a good suggestion of a "trial run" of sorts with it. If you could record yourself, then listen once it's worn off, that would be a good idea.
The beta blockers are also a good idea to look into. If I could turn back time I'd look at that before the benzos.