This thread has me thinking about the "barre genre" and I think there are even more sub-categories now than I first thought. Based on some comments in the above posts, I now see two large categories (Lotte Berk-based workouts and Ballet/Dance-based workouts) and each can be subdivided into two groups:
Lotte Berk-based barre workouts / Classic
Although there are some variations among these methods (e.g., more/less emphasis on tuck; more/less dynamic), they emphasize isometric work, feature certain exercices (e.g., c-curve ab work, plié in relevé, etc.), and tend to follow the LB class structure.
Core Fusion
Physique 57
Bar Method
Dailey Method
Fluidity
Pure Barre
Barre3
Pop Physique
Ballet Physique
Lotte Berk-based barre workouts / Fusion
These workouts feature a good amount of isometric work, some signature LB moves and/or class format. However, they integrate a greater amount of traditional callistenics, ballet, pilates, or yoga.
Ballet Body
Xtend
Booty Ballet
Ballet/Dance-based workouts / Classical ballet
These workouts adopt formal ballet terms, techniques, and exercices.
Ballet Beautiful
Ballet Bootcamp
Element Ballet
New York City Ballet Workout
Ballet/Dance-based workouts / Fusion
These workouts are strongly influenced by ballet and jazz but they combine these techniques with traditional callistenics, pilates or yoga.
Balletone
Jennifer Kries (The Method)
Jennifer Galardi's Ballet Body
Kari Anderson's Center Floor and Reach
Jennee's Ballet Blast
I am really overthinking this, aren't I?