Illuminations

Web 2.0 Pick of the Week
http://illuminations.nctm.org/ActivityDetail.aspx?id=36
Illuminations Sound Sketch Tool is a learning exercise that allows students to draw and map sound from National Council of Teachers of Mathmatics. K-12, but the Illuminations site is worth browsing for instructors and tutors in higher education.
Description:
Sound can be measured and quantified in many different ways. Sheet music is one way to represent a series of sounds. MP3 players and computers use a different representation to store a sound. This activity includes software that allows you to sketch and quantify sound using two different representations.