P is for… Plagiarism/sampling allegations
In recent years, there have been several cases of high-profile acts being accused of sampling chunks of chip music without seeking permission or giving credit, the most well-known examples being those concerning Timbaland and Crystal Castles.
There are plenty of other examples, however. It's slightly ironic, though, that back in the '80s, it was quite common for famous tunes to be used in videogame music, presumably with no legal permission sought. And they used to get away with it, too! It's fair to say that the ‘80s were more innocent times - these days, we're a lot more media-savvy, and musicians ought to know better.
P is also for… plogue chipsounds
Chipsounds is a virtual instrument that offers very accurate emulations of many sound chips, from common to obscure.