Véronique Gens, 49, was singing Béatrice in a concert revival of Benjamin Godard’s 1889 opera Dante at the old Royal Opera in Versailles. As she reached her final phrase – “Where the angels gather human tears to change them into stars” – she lost control of her voice and collapsed, first into the arms of the mezzo and then to the floor, her head lolling on her chest. The mezzo signaled to stop the music and an ambulance was called. The cause was evidently a sudden loss of blood pressure. (in French; Google Translate version here)