From Video Game Music Preservation Foundation Wiki
'Simon's Theme' is the song that plays during Block 1-1 and the 2nd phase of the Dracula Fight in Super Castlevania IV (SNES). This song is widely considered to be the Theme for Simon Belmont and has been remixed in many games since.
Super Castlevania IV (SNES)
Akumajō Dracula (X68)
Castlevania: Bloodlines (GEN)
Castlevania: Chronicles (PS1)
Castlevania: Harmony of Despair (X360)