This video is medium pace for first graders who are learning how to count by 2's. It is more detailed because it explains why we count by 2's and the song repeats itself so that the children can get what they are counting.
Source: youtube.com/ Mr. R.'s Songs for Teaching
This song teaches first graders how to count by 2's through a song in a fun, fast, and upbeat pace.
Source: youtube.com