Great Britain facilitates concert tours
The British government allows musicians to travel to European countries for concerts without a visa. Different rules apply to Switzerland.

According to its official communication, the British government has discussed with each EU member state the difficulties for representatives of the creative and cultural industries associated with planned trips to the mainland after Brexit. 19 member states have given assurances that British musicians and performers will not need visas or work permits for short-term tours.
The countries are: Belgium, Denmark, Germany, Estonia, Finland, France, Ireland, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Austria, Poland, Slovakia, Slovenia, Sweden, the Czech Republic and Hungary. The UK is also in talks with Spain, Croatia, Greece, Portugal, Bulgaria, Romania, Malta and Cyprus.
Original message (in English):
https://www.gov.uk/government/news/visa-free-short-term-touring-allowed-in-19-member-states
Based on a temporary agreement on the mobility of service providers, British nationals can work in Switzerland without a visa for a maximum of 90 days per calendar year.