Your children have really started to succeed with rhythms. We are going to start playing a game in my class called 'Poison Pattern.' You should ask your child about it, the game is very interactive and shows me if they can hear the small difference between rhythms.
The children have also been working on a chant called 'Miss White' this chant incorporates the rhythms they have been learning. The children know how movements to this song, and can even replace some of the words with movements. It is a great way to learn a song.
Second graders are also learning how to sing Yankee Doodle. While singing this song, we keep a beat somewhere on our body (ex: pat legs). In the next couple of weeks, they will each have a turn telling me where we can keep a beat, but with a two or four beat pattern. (ex: two beats: pat legs & clap; four beats: pat legs, clap, pat shoulders, pat head).