Composer and ukulele artist Jake Shimabukuro describes the concept of transposing notes in music and how ratios are applied in this video from Center for Asian American Media. Shimabukuro explains why it is necessary to transpose music written for a piano, or other instruments with a large range, to the corresponding notes on an instrument with a small range, such as a ukulele. In the accompanying classroom activity, students use ratios to transpose a short piece written for the ukulele back to a lower key for the piano.