Okay, so I couldn't come up with a better title for the thread. Sorry. Anyway. Throughout my writing, I occasionally slip in the name of a song, band, movie, etc. or a line or two of a song's lyrics. Is this allowed? Or would I have to get permission for that? Also, one of my major characters is a musician and I have a specific brand of guitar in mind for her. It's not an instance where I could just generally describe the guitar and leave out the brand; she is almost literally in love with this instrument, so the brand and model would be among the first things mentioned when she thinks about it. Again, allowed or no?