Vallon sonore
"Vallon sonore" was an aria from the opera Les Troyens by Earth composer Louis Hector Berlioz. 

Captain Jean-Luc Picard listened to the aria in his ready room aboard the  just before the decision to violate Starfleet orders, and enter the Battle of Sector 001 in 2373. ()

de:Vallon Sonore
Vallon Sonore