Cheats42.net

Play as Bub:
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Complete a song in showtime mode with a "Platinum" rank.

Science Genius Girl song:
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Successfully complete arcade mode under the advanced difficulty
setting with at least a "Gold" rank on all songs.

Outtake video:
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Successfully complete all songs in showtime mode.

Like A Virgin video:
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Successfully complete showtime mode with at least a "Gold" rank
on all songs.

One Week song:
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Successfully complete showtime mode.

Play as Cherry:
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Complete a song in showtime mode with a "Platinum" rank.

Play as Kat:
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Successfully complete arcade mode under the beginner difficulty
setting with a "Platinum" rank on all songs.

Ladies Night song:
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Successfully complete arcade mode under the beginner difficulty
setting with at least a "Gold" rank on all songs.

How You Remind Me video:
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Successfully complete showtime mode with at least a "Platinum"
rank on all songs.

Smooth Criminal song:
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Successfully complete arcade mode under the intermediate difficulty
setting with at least a "Gold" rank on all songs.

One Week video:
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Successfully complete one song in each of the areas in showtime mode.

Play as Harmony:
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Successfully complete arcade mode under the intermediate difficulty
setting with a "Platinum" rank on all songs.

Alternate costumes:
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Successfully complete any song in showtime mode with a "Gold" or
"Platinum" rank to unlock alternate costumes for one of the default
characters. Note: A "Platinum" rank will unlock two bonus costumes.
Also, not all characters have alternate costumes.

Play as Martin:
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Successfully complete arcade mode under the advanced difficulty
setting with a "Platinum" rank on all songs.

Easier songs:
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You can fake the game by humming, rather than singing, at the correct pitch.