In an old band I was in we wrote a song in rehearsals. I came up with the arrangement for the solo. In discussions at a later point re songwriting I asked why I wasn’t credited, and told I was just doing what I was meant to and that wasn’t creative input. My response was OK, in that case tell me exactly what notes to play and when as I’ll no longer think for myself at all when it comes to playing. I left not long afterwards. In no way did I think we would ever make anything out of the band anyway, it was the principle, you have no value as you only play bass.