The 11th UbiMus — Ubiquitous Music Workshop (https://dei.fe.up.pt/ubimus/) was held at the Center for High Artistic Performance, the house of the Orquestra Jazz Matosinhos (OJM) in Portugal, during September 6–8, 2021. It was organized by the Sound and Music Computing (SMC) Group of the Faculty of Engineering, University of Porto and INESC TEC, Portugal, and OJM in collaboration with NAP, Federal University of Acre, Brazil. Due to mobility restrictions resulting from the Covid-19 pandemic, a hybrid format was adopted in this year’s workshop to accommodate the remote participation of delegates and authors that could not attend the workshop at Matosinhos.