How to Prevent Lipstick Transfer Onto Your Instrument

1. Use non-transferring products. Lipstain markers and water tints are always safe bets for this. From what I've heard on Bustle, the Topshop Beauty Velvet Lips lipstick is non-transferring. (Remove it with an oil-based makeup remover or coconut oil. You can use olive oil too.)
2. Set your lipstick with a powder. Just take some powder onto a brush and sweep it across your lips.
1. Baby powder is an inexpensive, easy solution for this. Your lipstick will look more pale, and the finish is a bit chalky.
2. Eyeshadows are a good option. You might wind up altering the color of your lipstick if you do not use an eyeshadow of the same color.
3. Translucent powder is the "best" option for a good finish that is true to color. If you apply too much, it will feel gritty on the lips. 
3.  Use a matte-ifier.  Smashbox Insta-Matte works for this. (I tested it at Sephora.)  However, it is rather expensive ($24.00 for 0.34 fl oz) and I understand that most musicians do not have huge budgets. The Maybelline Baby Skin Pore Eraser is a well-known dupe for this as are other matte-ifying primers (basically, anything with dimethicone in it).
4.  Do a "kiss test" to make sure you have eradicated all transfer. To do this, kiss your palm and press it into your face as hard as you can. Add more powder/matte-ifier until NOTHING comes off during the kiss test. 

Now you have a perfect pout as well as a perfect part for your concert! Here is a picture of me wearing Benetint for an audition. (I used two coats to achieve the look below.)