Portable audio systems run from a solar-charged DC battery and provide amplification and sound control for both instruments and voice. As a less expensive alternative, the equipment can plug into a vehicle through the cigarette lighter receptacle. You might have to park on a hill to get the car started again though. An upgrade to the car system would involve a simple and inexpensive battery isolator. A portable battery pack gives independence from the vehicle - you can move off down that trail and find just the perfect meadow or clearing.
Solar panels extend the battery life and music time.
You can size a solar system based on the maximum amount of concert or practice time you would like. Most remote villages and communities more than welcome a traveling minstrel or band. With the right equipment, numerous musical opportunities unfold. Consider renting equipment. Besides renting and sizing products for musicians, sound systems help everyone from missionaries wanting to extend their message to educators and health professionals teaching classes to families and groups wanting to enliven their parties.