<span>The PLATO answer is C, in the order B,A,C.</span>
In my opinion you should do what you love. It is very unlikely to have a successfully career in art, and engineering is definitely a safer choice. But life is about taking risks, and you want to do what makes you happy with the time you have
Usually, you have a lead guitar and another guitar player, a bass guitar, keyboard/synth, a drumset, and the vocalist. Old rock bands, like Earth Wind and Fire, used to have brass instruments (trumpet and trombone, occasionally saxophone[woodwind]) as part of the instrumentation. It depends on what era of rock you are looking for, but this is the most common instrumentation. Hope this helps! :)
What commercial are you talking about...
