Being a long-running LightNovel with a popular SpinOff, both of which have currently two seasons of animated adaptation each, ''LightNovel/ACertainMagicalIndex'' (as well as ''Manga/ACertainScientificRailgun'') brings a great deal of songs to the table, and all of them are [[SugarWiki/AwesomeMusic awe-inspiring]].
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* All four openings ([[http://www.youtube.com/watch?v=54hNMot2H4E "PSI-missing"]], [[http://www.youtube.com/watch?v=qZkux4op4DE "masterpiece"]], [[http://www.youtube.com/watch?v=iLwT3YSTPMI "No buts!"]] and [[http://www.youtube.com/watch?v=97SVZimks_E "See visionS"]]) are great songs.
* Index's ThemeMusicPowerUp, [[https://www.youtube.com/watch?v=QPlL4P5Cz4E "jellyfish"]], is freaking awesome!
* Episode 12 of Index Season 1 gave us a very nice insert song called [[http://www.youtube.com/watch?v=LCHGR4_XG6Y "Ame"]].
* [[http://www.youtube.com/watch?v=9ArZVKo7EcA "King of Witch Hunters (Majou Kari no Ou)"]], [[http://www.youtube.com/watch?v=fLzWzpMdS64 "Overdrive"]], [[http://www.youtube.com/watch?v=pKXaEYHnVVc "Turnabout (Gyakuten)"]], and [[http://www.youtube.com/watch?v=-Ofmj4ouopc "Breakthrough"]] all deserve mention. For that matter, [[http://www.youtube.com/watch?v=Qx6YL1ld0iY "Imagine Breaker (Gensou Goroshii)"]] deserves just mention too, being the origin and base for Breakthrough.
* The second season has some downright brutal battle theme songs: [[http://www.youtube.com/watch?v=Wz8iXVp2vGM "Greater Power (Kyoudai no Chikara)"]], [[http://www.youtube.com/watch?v=PemRTNwCo0Y "Scheme (Sakubou)"]] and [[http://www.youtube.com/watch?v=5D7Kj5qHbzU "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 [[http://www.youtube.com/watch?v=mZOQXqmZzKE "New Fight (Arata Naru Tatakai)"]], [[http://www.youtube.com/watch?v=1nU3sFT8ths "Large-scale Magic (Dai Majutsu)"]] and [[http://www.youtube.com/watch?v=prb2c1AnzVU "The Queen's Fleet (Joou Kantai)"]]. Also, [[http://www.youtube.com/watch?v=TUJ1CZR0e-Y "Hymn (Seika)"]] supplies our daily dose of SoundtrackDissonance when [[spoiler: Accelerator awakens and punches Kihara so hard the man '''[[SugarWiki/MomentOfAwesome burns up in the fucking atmosphere while flying away]]''']].
* The theme song to TheMovie, [[http://www.youtube.com/watch?v=eVeFToEuZd4 "FIXED STAR"]], also deserves a mention.
* The SpinOff, ''Manga/ACertainScientificRailgun'', has its own in its OP, [[http://www.youtube.com/watch?v=stjdWX1oKn8 "only my railgun"]].
** For more great music, listen to the second opening, [[https://soundcloud.com/ifaizul-hasan/level5-judgelight "LEVEL5 -judgelight-"]] and [[https://soundcloud.com/raffiq-shima/my-only-railgun-late-in-autumn "late in autumn"]].
** From the OVA, we got [[http://www.youtube.com/watch?v=m9yOgj567kc "future gazer"]] while from the video game we got [[https://soundcloud.com/aki-wong/01-way-to-answer "way to answer"]].
** The second season, ''Railgun S'', gives us the epic openings, [[https://soundcloud.com/ansori519/sisters-noise "sister's noise"]] and [[https://soundcloud.com/hensei25/eternal-reality "eternal reality"]].
** [[http://www.youtube.com/watch?v=OLfA1GhW97c "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 [[https://www.youtube.com/watch?v=Nw8oFkORyjU "Tokiwadai Junior High (Tokiwadai Chuugakkou)"]], [[https://www.youtube.com/watch?v=JOxdNM-NfUs "This is Judgement! (Judgement desu no!)"]], [[https://www.youtube.com/watch?v=Rl9hZoTQj08 "battle area"]], [[https://www.youtube.com/watch?v=qsfRmlrIBPk "Tokiwadai Dormitory (Tokiwadai Joshiryou)"]], [[https://www.youtube.com/watch?v=ZLkFFkn3TCI "high speed"]], and [[https://www.youtube.com/watch?v=MWZaYM0cLZQ "Evening at Academy City (Gakuen Toshi no Yuugure)"]].
* ''[[TheMovie The Miracle of Endymion]]'' adds more to the list, especially the insert songs from Arisa Meigo (singer: Creator/SachikaMisawa): [[http://www.youtube.com/watch?v=IeqFAJ-AiXs "Telepath ~Hikari no Tou~"]], [[http://www.youtube.com/watch?v=8GTnGx8NqFc "ATARIMAE no Kyori"]], [[https://www.youtube.com/watch?v=trgAXuDK7J8 "Brand New Bright Step"]], [[http://www.youtube.com/watch?v=e0elZ_WwKmQ "Gloria"]], [[http://www.youtube.com/watch?v=PRYvIT9X39Y "Ashita, Hareru Kana"]], and [[https://www.youtube.com/watch?v=OgDcI-KVpl0 "OVER"]] (topped by a [[http://www.youtube.com/watch?v=TZtC0YvgQFU duet]] with Creator/YokoHikasa at the movie's climax). The score itself reintroduces familiar re-arranges of [[https://www.youtube.com/watch?v=RMMh2ycK8-Q "Hey, Touma!"]] and [[https://www.youtube.com/watch?v=vKXBzs6ugBE "Tokiwadai Dormitory"]] while mixing them with newer tracks such as [[http://www.youtube.com/watch?v=aD5kVqLG0KQ "What that bastard did!"]] and [[https://www.youtube.com/watch?v=VxtptVgtnqA "Those cursed by magic"]].
* For the ''LightNovel/ACertainMagicalIndex'' TV Songs Album, the singers of the openings and season 2 endings (Mami Kawada and Maon Kurosaki respectively) got together for a duet called [[http://www.youtube.com/watch?v=w_o6cjFxrXE "Snap out of it!!"]]. Needless to say, it makes a perfect addition to the series fantastic music catalogue.