I wouldn't say I am frustrated as a bass player (or indeed as a guitarist or a singer). Then again, the idea of being able to 'express yourself' sounds like tree-hugging hippy twaddle to me. I play music because, to quote Eddie Cochran, '[font=arial,helvetica,sans-serif][color=#474747][size=4]When it all comes true man, wow, that's something else!' - by which I mean, hearing the band playing great and realising you're a part of it, and (sometimes) seeing/hearing the audience acknowledging that fact by cheering, dancing etc.[/size][/color][/font]