This article presents exploratory research investigating the way teachers integrate music into their regular mathematics lessons as well as the effects of music-mathematics interdisciplinary lessons on elementary school students' mathematical abilities of modeling, strategy and application. Two teachers and two classes of first grade and third grade students (n = 46) participated in the present study. The two teachers designed and implemented music activities as an integrated part of their regular mathematics lessons across five weeks. Results demonstrated that both teachers integrated a variety of music activities with different mathematical content. The music-math interdisciplinary lessons had positive effects on multiple mathematical ability areas.