The battery box may not be "necessary" but it will probably help, depending on the mics. There are a lot of threads that you can search about "best set of mics for a newbie, on this or that budget, for this purpose etc. Check the mic section of the board first, and then try the search function. + T and welome to the board. You will find this to be one of the most valuable resources on the planet if you tape live music.