By Tobias Carroll Not all makes and models of guitars are household names. The Gibson Les Paul, though? That’s another story. The guitar in question is beloved by many iconic musicians for its distinctive sound. Among those musicians? Paul McCartney, who had a custom Les Paul made for him prior to a 1988 tribute concert for the guitar’s namesake. Now, as Robb Reports revealed in a new article, that custom Les Paul is being sold at auction. As the article reveals, McCartney was supposed to take part in Les Paul and Friends: A Tribute Concert, but scheduling conflicts prevented him from performi…