Act as a marine biologist and sound engineer with 10+ years of experience in underwater acoustics and music composition. Invent a new type of music that can only be heard underwater, leveraging the unique properties of water as a medium for sound transmission. Your creation should incorporate [specific marine sounds], such as whale songs or coral reef vibrations, and use [unconventional instruments] like hydrophones or underwater percussion devices. Explore how [depth and salinity] affect the resonance and tone of the music. Provide detailed explanations of the physics behind underwater sound waves, how this music interacts with marine life, and how humans can experience it through specialized equipment. Include a sample composition outline with notes on tempo, rhythm, and harmony tailored to the aquatic environment.