I feel like 90's musical nostalgia has been attempting to assert itself recently, and as long as we're talking white people (American or British) I protest violently to this motion.
Far as I'm concerned the airwaves have been just fine recently and no I would explicitly NOT like to return to angsty butt rock, ska mall punk, badly dated techno, too cool for school lo-fi masturbation, and stupid ass late 90's novelty songs.
The black stuff on the other hand yes, except New Jack Swing (Poison excepted). White exception also for some of the late 90's bubblegum pop stuff, which is just fun.
If you are an 00's kid/baby do not listen to the people pushing this. DO NOT.
–- Update From New Post Merge ---
Truly worthy of nostalgia:
Hip Hop (early and middle 90's)
R&B (middle and late 90's).
Hip Hop crashed its golden age around 1997 or so, there's a hugely visible drop off in amount of goods around that time.
And early 90's RnB was in this awkward stage where it had lost massive territory and stature to rap and had yet to properly accept this fact. So it was mostly coming out in this sort of midlife crisis form of well dressed young guys with hi-top fades trying to sound mischievous and suave and totally just as cool as the hip-hoppers (they were not). By the mid-90's you get stuff like R Kelly and Mary J Blige where RnB finally bowed down to the new genre lord of black music and let it lead the way. And what do you know it sounded way less forced and try-hard!