FYI... Long Read:
For me the 80's was the best decade for music in general. Sure the 50's had some great artists (Elvis Presley, Chuck Berry, Little Richard, Buddy Holly, Ray Charles, etc.), the 60's gave us the British Invasion (Yardbirds, the Beatles, the Rolling Stones, the Who, the Animals, the Zombies, etc.), along with some legendary American acts (Johnny Cash, the Beach Boys, the Doors, Jimi Hendrix, Grateful Dead, Creedence Clearwater Rival, etc.), which led the way for so many great bands/artists and guitar hero's in the 70's (Black Sabbath, Led Zeppelin, Deep Purple, Pink Floyd, Aerosmith, Alice Cooper, Eagles, Rush, etc.), which gave way to what we saw in the 80's. The 90's was a progression of the 80's with new genres like Grunge (Green River, Mudhoney, Nirvana, the Melvins, Pearl Jam, Alice In Chains, etc.) and Alternative Rock (Soundgarden, Smashing Pumpkins, Stone Temple Pilots, Jane's Addiction, etc.), and even Nu-Metal (Slipknot, Korn, Godsmack, System of a Down, etc.), and we saw a re-birth of Country and Country Rock (Garth Brooks, Brooks & Dunn, Shania Twain, Tim McGraw, etc.) but once the 2000's rolled around things became stagnate in my opinion, and nothing really new came about. Some of the genre's died off for the most part along with many of the bands from those genres. Personally I think it was because so many record labels over-saturated the market with lesser quality bands trying to capitalize on the moment. For the me the last 20+ years hasn't given us much in my opinion.
I think most artists/bands from the past 20 years rely to much of other people to write their songs, or they use Pro Tools and over produce an album instead of playing music from the heart and with feeling. There's a reason why songs from the 50's through 80's sound great still today; many albums were done on a minimal budget, recorded in a handful of takes, some recorded live, recorded with none or minimal over-dubs, and they weren't over produced, so what you heard on an album is what you got in concert. Today's music is spliced together from about 100 different takes and you just don't get the same feel.
The 80's had so much variety, and so many great artists in so many different genres (Pop Rock, R&B, Blues Rock, Country, New Wave, Hip-Hop/Rap, Punk, Hardcore Punk, Soft Rock/Adult Contemporary, Hard Rock, and Heavy Metal. With Heavy Metal we saw new sub-genres be born such as Glam Metal, Thrash, Speed Metal, Progressive Metal, Power Metal, Death Metal, Black Metal, Doom, Grind-core, and Industrial Metal. If you're a Heavy Metal fan, the 80's were the best.
Here are a few examples of some of the quality bands/artists that were influential in the 80's.
Pop Rock - Michael Jackson, Madonna, Cyndi Lauper, Duran Duran, Wham, etc.
R&B - Boyz II Men, New Edition, Tony! Toni! Tone!, Bell Biv DeVoe, etc.
Blues Rock - Stevie Ray Vaughan, Dire Straits, and a rebirth of so many great blues musicians
Country - Alabama, The Judds, The Oak Ridge Boys, Dolly Parton, Kenny Rogers, etc.
New Wave - Devo, Talking Heads, Depeche Mode, Simple Minds, etc.
Hip-Hop/Rap - Run D.M.C., Public Enemy, The Sugarhill Gang, The Fat Boys, Beastie Boys, etc.
Punk/ Hardcore Punk - Ramones, Bad Religion, Bad Brains, Dead Kennedys, Black Flag, Agnostic Front, etc.
Hard Rock - Van Halen, Scorpions, Journey, AC/DC (re-birth), Aerosmith (re-birth), etc.
Heavy Metal - Ozzy Osbourne, Dio, Judas Priest, Iron Maiden, Guns N' Roses, etc.
Glam Metal - Bon Jovi, Poison, Motley Crue, Def Leppard, etc.
Thrash - Metallica, Megadeth, Anthrax, Slayer, Testament, Overkill, Exodus, etc.
Progressive Metal - Rush, Queensryche, Savatage, Fates Warning, etc.
Power Metal - Manowar, Helloween, Gamma Ray, Riot, etc.
Death Metal - Death, Possessed, Morbid Angel, Cannibal Corpse, Obituary, etc.
Black Metal - Venom, Bathory, Celtic Frost, Mayhem, etc.
Doom - Saint Vitus, the Obsessed, Candlemass, Trouble, Witchfinder General, etc.
Industrial Metal - Ministry, Skinny Puppy, KMFDM, Nine Inch Nails, etc.
Again, with all the great bands from the 50's through 90's, my vote still goes to the 80's for best decade of music.