Just like cereal commercials and board game commercials, a lot of candy bar commercials were pretty catchy. Let's see, Almond Joy and Mounds ("Sometimes you feel like a nut, sometimes you don't") and Reese'e Peanut Butter Cups have been mentioned. Here's some others:
The 80's had a Kit Kat commercial "Give me a break , give me a break, break me off a piece of that Kit Kat bar." In the 70's, it was a husband coming home with two Kit Kats for his wife (but behind him were two lions!).
There was the one in the 70's for the $100,000 bar: "Da da. Da da da da da da. This is your caramel bar. Ahhhhh! Nestle's $100,000 bar."
Milky Way, Mr. Goodbar, and Three Musketeers all had musical ones but none really stood out too much to me.
In the 80's Snickers had the familiar, "It's so satisfying." I think in the 70's the commercials were mainly the non-musical, "No matter how you slice it, (then the bar was sliced in many slices) it comes up peanuts."
Around the 80's I think was when Nestle Crunch had the song, "Chocolate is scrumptious. When it crunches. That's why I love Nestle Crunch."
Hershey was already mentioned, "Hershey is real milk chocolate I love that Hershey bar.... cause Hershey is the great American great American chocolate bar." (Anyone ever been to Hershey Park in Hershey, Pennsylvania? They got a cool Hershey chocolate ride there. First time I went there was way back around '73 or '74).
In the 70's there was O Henry that showed Hank Aaron hitting homeruns.
There was also a Reggie bar in the late 70's/early 80's that simply had Reggie Jackson eating his bar and saying, "Mmmm. You're pretty good, Reggie." Actually, it was indeed real good! It's too bad they ceased making them.
Can't think of how commercials went for Zagnut, Butterfinger, or Baby Ruth, but those are all delicious too.
I think it's time to go get a snack!