Game - match the connection with these items  

I'm going to name 3 items, and your task is to name what these 3 have in common, BUT it has to be a six letter plural word (meaning it ends in "s").
Here's an example:Railroad, wild animal, music CD
Answer= "tracks"Have fun! :)
1.) Trombone, children's playground, laboratory microscope
2.) Hunting dog, compass, scoreboard
3.) Dungeon, jewelry store, sequence
4.) Fish, sheet music, dieters
5.) Municipal parking lot, electric utility, rhythym in verse
I will post the answers to these tonight! If you get all 5 right, I'll give you a +!!!:)