The original Japanese version has the same music for AREA_C and AREA_F.
This hack takes music from the USA version's (aka Shatterhand) AREA_C (Submarine level) and adds it to AREA_F (or to AREA_C in the alternate patch). Now all the areas have their own music.
Note that the AREA_C music and level were replaced in the USA version, and duplicated music is also present in the USA version.
[This hack is only for the Japanese version.]
Tokkyuu Shirei - Solbrain (J).nes
(GoodNes 3.23b)
CRC32: 9D922166
MD5: AF77B204D8A38ACE92F1F20185627808
SHA-1: 414E7AB212CBD2F5502D4C57264F9CBFE5075AE7