I am not, nor have I ever been, a musicologist; but when I think of eighties rock I think "big sound". Loud and lyrical. Big percussion, loud guitars, turn up the volume...
If any tune ( in my mind, anyway ) heralded the "big sound" of the eighties it is the supergroup Asia's "Heat Of The Moment".. Just take the group Journey's best, and ratch it up a few notches ( or turn it up a few decibels or whatever) for that big ( and loud ) sound --- that's the eighties ( to me, anyway ). This followed by my actual two rock favorites of the decade, Bon Jovi's "Livin' On A Prayer" and Guns N' Roses' "Sweet Child O' Mine" ... Enjoy, and I know you have your own favorites !