Alexander Schubert's WIKI-PIANO.NET is an internet-based score, commissioned by the author and performed by him on an international tour from 2018 to 2020. The website score contains modules of notation, text, images, video and sound that can be edited by any member of the public, similar to a Wikipedia page. This article explores the huge volume and variety of content added to the score over the first 20 months after the premiere, and the extreme compositional approaches and unusual patterns of internet behaviour displayed. Examining these contributions offers insights into the online culture of new music, including its approaches to humour, its creative competitiveness, its mastery of memes, and its sophisticated subversions of the relationship between composer, performer and audience.