Metal is often associated with loud, fast, angry music. And, yet, I have managed to put together a whole playlist on Spotify called "Metal Beauties and Ballads". Some samples.
Visions of Atlantis has at least one power ballad per album. With the powerful voice of Clementine Delauney onboard, they'd be fools not to. She can belt like almost no one else in symphonic metal (even gives Floor a run for her money at times) and is an opera-trained soprano, taking the music to the stratosphere when needed. "Underwater" is a classic example, appearing on Pirates II - Armada, the band's most recent album.
And you had to know Floor would make an appearance. "Lonely" is a ballad from After Forever, the band that launched her career. She recently revived it for her Strijdlust tour of the Netherlands, but this performance is from 2007 when After Forever was still a going concern. Pianist is the band's keyboardist Joost van den Broek, now a noted producer, writer, and session musician in the European metal scene.
And another great Dutch voice, Charlotte Wessels, with her old band Delain. This is a real beauty of a song written by band founder and keyboardist Martijn Westerholt with lyrics by Charlotte, then only 20.
And finally, a beautiful piece from a less expected source. Rivers of Nihil are a progressive death metal band that has leaned heavily into the "progressive" part in recent years, giving us this beauty. There's growls in the chorus but they are more despair than grim aggression.