The prospective student just enters their name, their interest (band, orchestra, choir, or theatre), and their preferred method of communication (text message or email). What high school musician will say no to this offer?! Its compelling, its exciting, and its super easy for them to take advantage - they only need to provide three pieces of information. You are offering the ticket as bait to initially attract the student and get them to submit their information. You are putting your best foot forward to collect his or her contact information and start a high-quality relationship with a high-quality prospective student. If you can't do this they are going to study music at a different school or get involved in an activity on campus other than music.
Now, imagine the same call-to-action, but this time, the student needs to submit both their phone number and email address, and their date of birth, and their full home address, and application status, and a bunch of survey questions, and an emergency contact person! The student is thinking to themselves, Woah, Im just interested in learning more about this music program, why do they need all of this information from me?? The more information you try to collect from people at the first point of interaction, the fewer people will submit your form. Once they navigate away from your form, they are gone for good.
At the first point of interaction, you want to ask for as little information as possible to reduce friction and increase the chance that everyone will complete your form. You only want to ask questions that hold some meaningful and useful purpose. In other words, the information you collect from people should align to the content you send them to create a more personalized experience. For example: