Apologies in advance for the belabored, pedantic post.
Regarding the "bubble gum" observation, looking back at a list of the year, 1970 was a really interesting year, strains of music branching down into heavier proto-metal and at the same time sugar coated, lightweight stuff that was popular and agonizing.
-Examples, sorry it's necessary to do this:
"My Baby Loves Lovin"- White Plains , "Love Grows (Where My Rosemary Goes)" - Edison Lighthouse. Big Ouch.
In retrospect, a time still dominated by AM radio, when a wide range of songs would be heard on the same popular stations.
A big year for one hit wonders, lots of popular songs that followed in the footsteps of "Something in the Air" from the year before.
A contemporary rock equivalent of something like Tin Pan Alley - popular songs - just played by bands with longer hair.
Short-lived. Lots of organ.
e.g. "In the Summer Time" - Mungo Jerry. "Venus" - Shocking Blue, "My Bell Amie" Tee-Set. "Spirit in the Sky" - Norman Greenbaum.
And at the same time, the further establishment of much of what would become the replayed to death hits "Classic Rock", ELP - Trilogy, Jethro Tull - Benefit, Van Morrison - Moondance. CCR - Cosmo's Factory, Black Sabbath, Led Zep lll, American Beauty, Deep Purple, Mountain.
And, not in the least of those that year...The Twelve Dreams of Dr. Sardonicus by Spirit.
Band of Gypsies, Bitches Brew.