Being a long-running Light Novel with a popular Spin-Off, both of which have currently two seasons of animated adaptation each, A Certain Magical Index (as well as A Certain Scientific Railgun) brings a great deal of songs to the table, and all of them are awe-inspiring.
- The first opening for A Certain Magical Index anime adaptation, PSI-missing
, has keyboard synthesizer and electric guitar tunes symbolizing the Science side combined with deep lyrics and vocals by Mami Kawada symbolizing the Magic side. This song successfully encapsulates the main premise of this series about how Magic and Science are more or less two sides of the same coin. Many fans consider this song as "The song that started the whole series". - Index's Theme Music Power-Up, "jellyfish", is freaking awesome!
- Episode 12 of Index Season 1 gave us a very nice insert song called "Ame".
- The second season has some downright brutal battle theme songs: "Greater Power (Kyoudai no Chikara)", "Scheme (Sakubou)" and "A Shadow Draws Near (Semaru Kage)", which also doubles as Accelerator's new theme song. Who says anime fights and trance music can't go well together?!
- The second OST gives us "New Fight (Arata Naru Tatakai)", "Large-scale Magic (Dai Majutsu)" and "The Queen's Fleet (Joou Kantai)". Also, "Hymn (Seika)" supplies our daily dose of Soundtrack Dissonance when Accelerator awakens and punches Kihara so hard the man burns up in the fucking atmosphere while flying away.
- "Sheol Fear", a mysteriously solemn track which plays when Index performs Sheol Fear spell to exploit the contradictions of the Roman Catholic Church doctrines and use it as a weapon to hurt the religiously fanatical Roman Catholic nuns.
- The theme song to The Movie, "FIXED STAR", also deserves a mention.
- The Spin-Off, A Certain Scientific Railgun, has its own in its OP, "only my railgun".
- For more great music, listen to the second opening, "LEVEL5 -judgelight-" and "late in autumn".
- From the OVA, we got "future gazer" while from the video game we got "way to answer".
- The second season, Railgun S, gives us the epic openings, "sister's noise" and "eternal reality".
- "Electric Chase" is the perfect theme song of Mikoto's tsundere side, so much so that it was reused in the second season of Index!
- The soundtrack used in Railgun is just as amazing as the music used in Index. You have "Tokiwadai Junior High (Tokiwadai Chuugakkou)", "This is Judgement! (Judgement desu no!)", "battle area", "Tokiwadai Dormitory (Tokiwadai Joshiryou)", "high speed", and "Evening at Academy City (Gakuen Toshi no Yuugure)".
- "Frenda" adds more intensity to an already intense and gritty Sister arc and proves to the fans that a Level 0 esper can be badass too.
- For more great music, listen to the second opening, "LEVEL5 -judgelight-"
- The Miracle of Endymion adds more to the list, especially the insert songs from Arisa Meigo (singer: Sachika Misawa): "Telepath ~Hikari no Tou~", "ATARIMAE no Kyori", "Brand New Bright Step", "Gloria", "Ashita, Hareru Kana", and "OVER" (topped by a duet with Yōko Hikasa at the movie's climax). The score itself reintroduces familiar re-arranges of "Hey, Touma!" and "Tokiwadai Dormitory" while mixing them with newer tracks such as "What that bastard did!" and "Those cursed by magic".
- A Certain Scientific Accelerator's opening theme, "Shadow is the Light", is the perfect theme music for the Strongest Esper, and ditches the usual synthpop sounds from the other openings for a heavier Industrial Metal sound with lyrics that perfectly encapsulate Accelerator's journey from villain to hero.
- For the A Certain Magical Index TV Songs Album, the singers of the openings and season 2 endings (Mami Kawada and Maon Kurosaki respectively) got together for a duet called "Snap out of it!!". Needless to say, it makes a perfect addition to the series fantastic music catalogue.
