why does the tokyo ghoul theme song sound so familiar

One of Shirou Sagisu's pieces (' Decisive Battle ') for Neon Genesis Evangelion is suspiciously similar to a John Barry composition, '007', used in From Russia with Love.Hyperdimension Neptunia the Animation has an end credits theme that has a soundalike of Brian Culbertson's 'Colors of Love', entitled 'Neptune Sagashite' by Afilia Saga.The Second Raid switches it out for ' Shissou ', a piece suspiciously similar to the theme from Airwolf. 'Tokku Yarou' is also used in Fumoffu for the next episode preview.Also, in Full Metal Panic? Fumoffu, the ending song, 'Kimi Ni Fuku Kaze' sounds VERY similar to Santana and Michelle Branch's 'The Game of Love.'.Lampshaded with a cameo as a cellphone ring tone and someone says it sounds like an old American TV show (which indeed was called Tokkou Yarou A-Chiimu when broadcast in Japan). The title is actually 'Tokkou Yarou?' / 「特攻野郎？」(yes, with question mark) which means something along the lines of 'Gung-ho guys'. Full Metal Panic!: 'Tokkou Yarou', a background theme used in that series is incredibly similar to the theme from The A-Team.Nandemo Q was a children's television show which aired on NHK between 19 that featured educational Suspiciously Similar Songs of popular western songs that often featured Pun Based Titles such as ' Hotaru California '.

The track 'Ikamino Gekiban' sounds like the theme song from The Simpsons for some reason.

The second episode uses a parody of Metallica's 'Sad but True.'.

For whatever reason, Gojou Shioji from Excel Saga appears to have ' Another One Bites the Dust' as his theme song, with a few courtesy notes thrown in.

The theme 'Nunnally' from Code Geass uses the same melody, same lead instrument, SAME KEY, and a similar chord progression to the main theme from an obscure Ennio Morricone-scored film, Malena.Bomberman Jetters: Mujoe's theme sounds more like a Shout-Out to the Seinfeld theme, as it uses ALL the instruments and arrangement of the infamous theme, but with just little changes on some notes.The opening to Sarutobi, the Third Hokage's Battle Theme Music, is an almost exact copy of Ozzy Osbourne's 'Bark at the Moon'.Orochimaru's theme in Naruto borrows part of its melody from Bach's Toccata and Fugue in D minor.The lyrics of the song ' Golgo 13 and I ' sung by Cindy Wood from the 1983 anime film Golgo 13 sounds closely familiar to the 1970 spaghetti western Opening theme of Indio Black/Adios Sabata composed by Bruno Nicolai.' Uprising ' sung by the English rock band Muse takes its inspiration from the song Pray For You sung by Cindy Wood from the Opening of the 1983 anime film Golgo 13.

Why does the tokyo ghoul theme song sound so familiar