The 1957 Les Paul Junior is a guitar I really love. The most well-known user of this instrument was Mountain guitarist Leslie West, who was universally beloved for having one of the heaviest guitar tones of all time. But there are many different sounds, both ultra-clean and distorted, that this instrument can provide, making it a perfect choice for just about any type of guitar-based music.
I treat the Les Paul Junior like a Fender Esquire, in that you can get a ton of different sounds out of a simple guitar fitted with one pickup, one volume control and one tone control. In the case of the Junior, it is fitted with a P90, which is a large, high-output single coil pickup.