Introduction: Understanding Music Interaction and Why it Matters -- Part I DESIGN -- A Design WorkBench for Interactive Music Systems -- TMAP Design Cards for Technology-Mediated Audience Participation in Live Music -- The Poetry of Strange Connections: An Interview with Bill Verplank -- The Groove Pizza -- XronoMorph: Investigating Paths Through Rhythmic Space -- HCI Music and Art: An Interview with Wendy MacKay -- Part II INTERACTION (to do) -- Material-Oriented Musical Interactions -- Embodied Musical Interaction: Body Physiology, Cross Modality, and Sonic Experience -- Making as Research: An Interview with Kristina Andersen -- Detecting and Adapting to Users' Cognitive and Affective State to Develop Intelligent Musical Interfaces -- Creating DMI's to Allow Non-Musicians to Create Music -- Music, Design and Ethnography: An Interview with Steve Benford -- Part III COLLABORATION -- Applying Game Mechanics to Networked Music HCI Applications -- Mediated Musical Interactions in Virtual Environments -- Machine Learning, Music and Creativity: An Interview with Rebecca Fiebrink -- Free-Improvised Rehearsal-as-Research for Musical HCI. -- A Case Study in Collaborative Learning via DMIs for Participatory Music: Interactive Tango Milonga.