Beautiful well-known plants, among the best cacti in the world.

E. "Buttercup" is more yellow. (ABBEY BROOK ECHINOPSIS HYBRID)
http://www.abbeybrookcacti.com/ech_checklist.htm

This beautiful flower belong to Cereus, seems to me Cereus peruvianus. You can share pictures in internet.
Trichocerei have flowertube covered with some wool (and usually much more ribs).
I had a plant like yours that begun to flower at age of 4 years and height of 45 cm.

Beautiful flowers, nice rare mature plant!
(Mine one is smaller though old enough but hadn't flower yet.)
Very impressed.

Here is the same - ants often stole seeds from cacti fruits in my collection.

As for me the answer is simple -
Cereus peruvianus
Be careful, this plant may grow into huge tree, but flowers are splendid.

Wonderful plants!
Excuse me, but Parodia taratensis looks like Notocactus scopa...

Beautiful plant.
How old it was at it's first blooming?

Pilosocereus sp.
Espostoa sp. (lanata?)
Ferocactus horridus v.bevispinus
Mammillaria sp. (geminispina?)
Euphorbia sp.
Eriocactus leninghausii

Beautiful video! Very impressive! Ausgezeichnet!
Perfect pictures and music.
Thank you very much for sharing, Geoff!