"Step in Time" is a song and dance number from Walt Disney's 1964 film Mary Poppins which was composed by the Sherman Brothers.
In the 1964 film Mary Poppins, during the first part of the song, the lines Bert says in the verses are "kick your knees up", "'round the chimney", "flap like a birdie", "up on the railing", "over the rooftops" and "link your elbows" followed by an interlude.
The interlude continues with Bert, Mary Poppins, Michael, Jane and all the chimneysweeps dancing around the rooftops and as Admiral Boom, the Banks family's next-door neighbour, looks at them with the telescope, he thinks that they're Hottentot robbers, so he orders his assistant, Mr. Binnacle, to make them scram with colorful fireworks.
In the second part, as all the chimneysweeps get in the house of George Banks, Mrs. Brill walks into the living room looking at them and screams, "They're at it again!"
As Jane, Michael, Mary Poppins and Bert get in the same place, Ellen runs around the dining room with an "OW!!!"