Our band has recently started writing our own material, and i find it difficult to use any theory when making my own basslines. I have started going to lessons, and I've asked my teacher to teach me theory, but when it comes to band practice it's all lost on me. I end up playing what just sounds good in my head. I sing a tune in my head that fits with the music, and then play it. So what I'm asking is how much theory goes into your playing, and also what I could do to improve my playing. Thanks in advance.