Ray Barnholt wrote an great piece for 1UP.com on the use of FM synthesis in video game music. Writing on this kind of thing can be really dodgy, but this is pretty accurate and also pretty comprehensive, going over arcade games and Japanese PCs too. Check it out!
And I can’t recommend enough the Ubiktune albums mentioned at the end, FM FUNK MADDNESS!! and FM FUNK TERRROR!!. Also pretty much every other Ubiktune album released in the last year and a half.