These 38 videos teach EVERY SINGLE Common Core 1st grade math standard. Some of these songs were used in a 2009 study of 286 students. The researcher found that the songs decrease anxiety, increase motivation, and increase mathematics achievement (Kokobas, 2009; see reference below). I'd love to be able to make a difference in your classroom with them!***This set is sold separately from the song files, available here. If you already have the mp3 songs and lyric book, this is the product for you!