1. They didn't like the song
  2. They are waiting for their confusing feelings about the song to become clearer
  3. They want to hear it on better speakers before they comment
  4. They are waiting for other opinions among the creative team to come in before they react
  5. They are actively communicating with rest of creative team to send clear, non conflicting notes back
  6. They missed the email
  7. They are busy with life issues and forgot to follow through with email
  8. They are just flaky
  9. They are angry about something I did
  10. They are evil
  11. Ideas?