Oh, headphones. d

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The HD-555 are nice headphones. You're gonna like them.
My headphone inventory:
Sennheiser HD-600: for classical, jazz, vocal, and rock
Denon AH-D2000: for rock and dynamic music, not for classical
Grado SR60: for travel and sometimes portable
Sennheiser PX 100: for portable
JVC in ear: for portable when in noisy environments
Apple ear buds: as an example of how bad ear buds can sound