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Puffy AmiYumi is a Japanese Group Sounds act.
Literal
Puffy AmiYumi [topic-は] Japan [of-の] Group Sounds.
Noun-ending sentence with no copula — typical headline/caption style. グループサウンズ refers specifically to the 1960s Japanese rock-pop genre inspired by the British Invasion; calling the 1990s–2000s pop-rock duo Puffy AmiYumi (パフィー亜美由美) a グループサウンズ is either loose or factually off. The katakana+kanji spelling 亜美由美 is a stylized rendering of the members' names (Ami + Yumi).