In addition to all of the other workstations I've described in detail we have also worked on these:
Talk About Tunes: The can is filled with discussion starters. Some of the questions are easier than others. Some require higher level thinking and problem solving. I'm always looking for ways to add opportunities for meaningful learning conversations to take place in our classroom.
Music Symbol Concentration
Worksheet Workstation: This station usually contains a simple worksheet that allows students to demonstrate one of the concepts we are learning in class like note identification, instrument families, etc... This station is usually just for 2nd grade and up. I'm often sitting at this workstation to help students in small groups and assess their understanding of the material.