In Leuven, Article 424 doesn’t literally provide that playing off-key, but it does state that a musical performance must not give rise to “a disturbance of the public order or peace”. However, local authorities have interpreted this provision to prohibit playing off-key.
Art. 6143bb. State Flower Song Resolved by the House of Representatives, the Senate concurring, That it adopt the Bluebonnet song as the State Flower Song. Acts 1933, 43rd Leg., p. 930, H.C.R. No. 24.
No entertainment or music shall be provided or permitted for the enjoyment of the patrons of the establishment operated on public space by a permittee other than music as may be furnished by no more than three (3) musicians playing stringed instruments such as the violin, the viola, the cello, the double-base, and the guitar,…