"Frosty the Snowman" is a popular song written by Walter "Jack" Rollins and Steve Nelson, and first recorded by Gene Autry and the Cass County Boys in 1950. It was written after the success of Autry's recording of "Rudolph the Red-Nosed Reindeer" the previous year; Rollins and Nelson shipped the new song to Autry, who recorded "Frosty" in search of another seasonal hit. Like "Rudolph", "Frosty" was subsequently adapted to other media including a popular television special. The song was originally titled "Frosty the Snow Man".
The song is about a snowman who comes to life by the placement of a magical hat found by some children, with whom he shares playful adventures before he has to "hurry on his way" (likely a quaint reference to melting, and the ephemeral nature of snowmen). At the end of their adventures together, the children are saddened by Frosty's leaving, however, he reassures them by exclaiming, "I'll be back again some day."
Some versions of the song change the last line to "on Christmas Day!" It has been covered by many artists over the years, including The Jackson 5, The Ronettes, Bing Crosby, Nat King Cole, Ella Fitzgerald, Larry Groce, Ray Conniff, Cocteau Twins,...