Oh the memories! My elementary school had all three in addition to the the young reader's In A Dark, Dark Room and Other Scary Stories back in the early to mid 1900's (all by Alvin Schwartz). However, in more recent times, the books have managed to end up on banned book lists for libraries and many schools no longer have them.
I, too cannot recommend these enough! They are excellent short stories, songs, and poems drawn from Schwartz's studies in anthropology. He would basically go around towns in the US and tell stories and ask other kids and people to share their stories with him. Hence, many have the urban legend vibe to them. However, the other ones are down right creepy and brilliant. That and the vivid and sometimes grotesque illustrations make the sorties to die
for (sorry for the pun). He also included annotations as to where the sorties originated from.
I ended up buying the three book set on Amazon along with In A Dark, Dark Room and Other Scary Stories a couple of years ago.
Give them a try. If you're older or an adult, enjoy them for what they are and try sharing them with a son/daughter or younger brother/sister.