I can't really think of a very solid title for this, but I think "musical easter eggs" is pretty good. If you don't understand, what I mean is when the makers of music put in small bits of other songs into a new one or even entire remixes. I absolutely love these because they can add some depth to music and make you love it even more when you realize some of these things and they can bring nostalgia of what they're referencing. These are more subtle things I'm talking about. You can be a bit obvious, but not super blatant stuff everyone ever knows. As I said though, feel free to be pretty obvious because some people might have missed it and would like to know. This is mostly for soundtracks in games and movies, but some normal music can have this stuff too like musicians giving nods to past bands or even to their older albums.
Bear with me here, I know an awful lot, so prepare for a massive list:
- The instrumentals in "It Has to Be This Way" are the MGS Peace Walker theme
- Small parts in Lorule Castle from Link Between Worlds are the Hyrule castle theme backwards
- Some parts in Ballad of the Goddess from Skyward Sword are Zelda's Lullaby backwards
- The title screen theme for Ocarina of Time goes off of the recorder jingle from the original Zelda
- Twilight Princess's soundtrack was great because in nearly every important song in the game they included the main theme and Ganon's theme as well. Blizzeta's second form music has both Ganon's theme in it and the main theme. All three of the battles with Ganon at the end also included his theme in some way.
- Ook's theme from Twilight is a very distorted version of Saria's Song
- Phantom Ganon's theme from Wind Waker was a mix of the Ganon battle theme in Link to the Past as well as the human Ganondorf battle theme from Ocarina.
- Magmoor Caverns in Metroid Prime is the Norfair theme from Super Metroid
- Torvus Bog Depths from MP2: Echoes is the Brinstar Red Soil theme from Super Metroid
- The multiplayer theme from MP2: Echoes is the Brinstar Jungle theme from Super Metroid
- The Pirate World theme from MP3: Corruption is the Crateria theme from Super Metroid
- Metroid Prime 1, 2, and Hunters all had the title screen theme for their respective games as the intro for the final boss theme in the second phase.
- Connecting to the last easter egg, the Hunters final boss theme is a remix of the Metroid Prime 1 final boss theme, which might be the reason for having the same intro, but both games also had the same melody for the title screen theme which most Metroid games have in common. It might be both.
- Parasite Queen from MP1 is a remix of Mother Brain's theme from Super Metroid
- Amorbis from MP2 is a remix of Parasite Queen
- The Magma Boss theme from MP: Hunters is a remix of Parasite Queen
- Dark Samus' theme is a remix of Mother Brain from the original Metroid (different from Super's) The similarity is heard more when comparing it to Mother Brain's theme in Zero Mission, the remake of the original
- The Aurora Unit's theme from MP3 is a remix of Dark Samus' theme meant to sound closer to Mother Brain's theme
- Gandrayda's theme from MP3 is a mix of both the Chykka themes from MP2
- Savannah Citadel Day from Sonic Unleashed is a remix of the credits theme from the 8-bit version of Sonic 1
So there you have it! Anything you found interesting? Anything you'd like to show?