Visas
Since 1 January 2021, UK nationals seeking to work in the EU are considered third-country nationals and may need a visa and/or work permit to do so. These rules are set by each member state.
ARTIST MOBILITY - Austria
Information about the new visa system for Austrian visas only

ETIAS
Information about the new visa system expected to launch in January 2022 (this has not been updated since 2019)

Free Movement - The row over post-Brexit visas for musicians, explained
An explanation of the debate over post-Brexit visas

Incorporated Society of Musicians (ISM)
Tabular document with country-by-country information detailing visa requirements when working less or more than 90 days, costs and embassy contacts:

Musicians Union - Flowchart Guide to Working in Europe
Post Brexit deal, gigging in Europe sees the need for an increasing portfolio of documents to ensure trouble-free passage, to, from and through the 27 member states of the EU.
To help MU members with the increased administration, we have compiled an interactive flowchart for musicians travelling to the EU – either solo or in groups – to assist in making sure you have the correct documentation prior to setting off. The flochart guid contains links to useful online resources.

UK Europe Arts Work
short summary of visa requirements for temporary contracts

Viva la Visa
Visa advice for touring artists (special deal on advice for ISM members)
‘Our experienced team of visa experts are dedicated to working closely with clients to ensure the best chance of success with all applications. With offices in Suffolk and London, we make sure to place you in the best possible position for a positive outcome.’