In den Comments gibt es ne logische Erklärung: Der Backingtrack wurde falsch abgspieltSpielen die den Song jeder in seiner Lieblingstonart?
This is why you always confirm your sample rates, children. The synth is on a backing track, but the file's sample rate was probably 44.1kHz and the system's sample rate was probably 48kHz. Since there's a mismatch, the system sped up the track to match the sample rate. The problem was that Eddie and Wolfgang's instruments were still in the tuning that the song is supposed to be. Instead of stopping the show and rectifying the situation, they kept that trainwreck rolling.