Maxim Tesli, front man of a band called Shchenki (The Puppies), was detained at a St Petersburg airport, state news agency TASS reported. Local news outlet Fontanka said he had been charged with petty hooliganism.
Last month Nikolai Vasilyev, a rapper known as Vacio, was jailed for 15 days and fined 200,000 roubles ($2,182) for propaganda of "non-traditional sexual relations" after using a sock to hide his modesty at an "Almost Naked" party at a Moscow nightclub.
The event provoked a powerful backlash at a time when Russia is waging war in Ukraine and authorities are promoting an increasingly conservative social agenda. Many of the stars who attended have since issued public apologies.
It was not clear if Tesli's concert appearance was intended as a gesture of support for Vacio.
Russian media have reported that the rapper's initial 15-day sentence was later extended by another 10 days, and that he has been issued with a summons to appear at a military conscription office.
