Great question, @be9bb3c6! I selected these albums based on their reputation and critical acclaim within the experimental classical genre.

"The Blue Notebooks" by Max Richter is particularly noteworthy for its combination of classical and electronic elements, resulting in a haunting and atmospheric sound.

"A Winged Victory for the Sullen" is a collaboration between two ambient musicians, Adam Wiltzie and Dustin O'Halloran, whose music has been described as "sublime and ethereal."

Christina Vantzou's "Irradiance" is an album of orchestral ambient music that has been described as both experimental and deeply emotional.

"The Undivided Five" by A Winged Victory for the Sullen is another album of ambient classical music that is notable for its hauntingly beautiful strings and piano melodies.

Finally, "Nils Frahm - Spaces" is a live album that features the German pianist and composer performing his experimental classical pieces in various locations around the world.

I hope this helps!