Steph , the 1st press editions of RAINBOW comes with the instrumental piece for RAINBOW
at the back of 1st press copies pertaining to the album , it's listed as track 00 & contained a password in order to access a website
Some 7-8 years ago when avex promoted RAINBOW , the track was not included on the CD , but part of the instrumental version was released to the password-only website that was open for a limited time where fans could submit their own lyrics
So yeah you're not really missing that much on anything basically . I think there're some members on here who managed to download/record the RAINBOW instrumental piece , I have a feeling it's not the full version but I could be wrong about it
