Embodiments of a computer system to determine one or more annotation items associated with an audio file are described. During operation, the computer system provides an interactive environment in which multiple users listen to the audio file within a time interval. Next, the computer system receives one or more annotation items associated with the audio file from the multiple users. Then, the computer system displays the received one or more annotation items from the multiple users in the interactive environment, thereby enabling the multiple users to provide feedback to a given user in the multiple users.