What is usually the minimum number of new titles added annually to each group's repertoire in elementary music education?

The correct answer is based on the general practice in elementary music education, where it is common for educators to introduce a substantial number of new titles each year to keep the curriculum fresh and engaging for students. Adding around 15 new titles annually allows for a mix of music genres, cultural representation, and skill development opportunities. This number strikes a balance between ensuring that students are exposed to a broad variety of music while also allowing teachers to focus on quality instruction.

A lower number, such as 5 or 10, may limit the diversity and depth of the music education experience, making it challenging to cover various aspects of musical knowledge and skills over the academic year. Introducing 20 new titles could be overwhelming for both students and teachers, potentially leading to a dilution of focus on each piece. Therefore, setting the standard at around 15 provides an effective means to enhance the students' musical repertoire while still allowing for effective teaching and engagement.