This document describes a music lesson plan that uses a website to teach secondary students about Western music and a cappella singing. The lesson plan aims to develop students' sense of hearing, singing, and performing skills through group activities. Students will be grouped into threes and each sing a part to collaboratively perform pieces from the website without instrumentation. The website features audio examples of musical excerpts and individual parts that students can listen to in order to learn how to sing the pieces on their own and together in their groups.