The Sphere Theater, or the Luca Sphere Theater rather, is not so much as side quest as it is an optional area that you can visit. Completionists may consider it a side quest though as they seek to purchase and obtain all of the Music and Movie Spheres.
Theater Enthusiast
You will receive the Theater Enthusiast Trophy once you have purchased all of the spheres available at the Luca Sphere Theater.
The Music Spheres and Movie Spheres can be purchased for 2,000 gil and 5,000 gil each, respectively. They allow you to listen to music found throughout the game and watch videos and cinematic FMVs that occur as you play through the story.
Aside from being interesting pieces to collect, and being a requirement of the Theater Enthusiast Trophy, the Music and Movie Spheres serve no other purpose. The full list of Spheres that can be purchased are included below:
| M01: Zanarkand | M02: Prelude |
| M03: Tidus’s Theme | M04: Run!! |
| M05: Creep | M06: Battle Theme |
| M07: Enemy Attack | M08: Game Over |
| M09: Out Of The Frying Pan | M10: Victory Fanfare |
| M11: Leap In The Dark | M12: Underwater Ruins |
| M13: The Blitzers | M14: Wandering |
| M15: Besaid | M16: Spira Unplugged |
| M17: Phantoms | M18: The Trials |
| M19: The Summoning | M20: Braska’s Daughter |
| M21: Yuna’s Theme | M22: Good Night |
| M23: Decision On The Dock | M24: Movement In Green |
| M25: A Fleeting Dream | M26: Calm Before The Storm |
| M27: Face Off | M28: Grand Maester Mika |
| M29: Luca | M30: The Splendid Performance |
| M31: Auron’s Theme | M32: Blitz Off! |
| M33: Mi’ihen Highroad | M34: Chocobo Jam |
| M35: The Travel Agency | M36: Seymour’s Theme |
| M37: Moment of Truth | M38: Djose Temple |
| M39: Ridess The Shoopuf? | M40: Rikku’s Theme |
| M41: Oui Are Al Bhed | M42: Guadosalam |
| M43: Thunder Plains | M44: Jecht’s Theme |
| M45: The Burning Sands | M46: The Wedding |
| M47: Assault | M48: Tragedy |
| M49: Believe | M50: Servants of the Mountain |
| M51: Macalania Woods | M52: Via Purifico |
| M53: Bravely Forward | M54: The Unsent Laugh |
| M55: Seymour’s Ambition | M56: Illusion |
| M57: Yuna’s Decision | M58: Nostalgia |
| M59: Peril | M60: Launch |
| M61: Challenge | M62: Beyond The Darkness |
| M63: The Void | M64: The Truth Revealed |
| M65: Pursuit | M66: Gloom |
| M67: Patricide | M68: The Temple Players |
| M69: Hum of the Fayth | M70: Lulu’s Theme |
| M71: Wakka’s Theme |
| 01: Zanarkand | 02: We Called It “Sin” |
| 03: Sinspawn | 04: This Is It! |
| 05: Blitzball! | 06: A Summoner Is BOrn |
| 07: Lulu’s Contempt | 08: Kimahri’s Challenge |
| 09: Fear On The Sea | 10: Sin Arises |
| 11: Sin’s Threat | 12: Futile Resistance |
| 13: Failure | 14: Kilika Dusk |
| 15: The Dance | 16: Luca Harbor |
| 17: Let The Games Begin! | 18: The Legend Lives |
| 19: The Dark Aeon | 20: No Better Plan |
| 21: Judgment | 22: Ex Machina |
| 23: Sin’s Wake | 24: Reunion |
| 25: Metropolis | 26: Otherworld |
| 27: Sin Sleeps | 28: Homecoming |
| 29: Dry Dock | 30: Nayto Du Ku! |
| 31: Leaving Home | 32: The Glory Of Yevon |
| 33: The Red Carpet | 34: False Vows |
| 35: Believe | 36: The Spring |
| 37: The Summit | 38: The Last Chapter |
| 39: Sinrise | 40: Departure |
| 41: The Approach | 42: Terra Graviton |
| 43: Gravity Sucks | 44: Heaven’s Fall |
| 45: Vena! | 46: Machina Redux |
| 47: Sinfall | 48: Evenfall |
| 49: Face Off | 50: Breaking Through |
The cost of purchasing all of these Spheres can be quite heavy. Check out the tips and tricks section on earning gil for additional tips:
