The music scene is quite varied in Las Vegas. There are great opportunities for all sorts of musicians in various genres. Considering the casino and entertainment industry here is huge it opens many professional opportunities.
The local music scene is growing and has been over that last decade. Many talented musicians got there start here and continue to do so. Examples include, The Killers, Panic at the Disco, Brandon Flowers, Imagine Dragons, and many more.
To get a better feel for the music scene I recommend reading one of the local weekly magazines like, CityLife or Las Vegas Weekly. If your a teacher you can teach at many of the local community centers, colleges, or even start your own business (No state tax and easy Incorporation)
Hope that helps.