Course-based undergraduate research experiences (CURE) allow students opportunities to develop research skills. In a scaffolded CURE, music therapy and music education students composed, evaluated, and selected the music stimuli used in a music and mindfulness study with non-musicians at Site 1 and musicians at Site 2. The purposes of this paper are to (a) describe the process of student music stimuli composition and evaluation for use in a course-based undergraduate research experience and (b) identify benefits, challenges, and lessons learned from the viewpoints of students, graduate assistants, and faculty who participated in the multi-site study. Eight students, two graduate assistants, and two faculty provide an overview of the CURE teaching model and assignments, and share first-person accounts of their experiences participating in this CURE.