Wikipedia definition
1. AitakattaAitakatta is Japanese idol group AKB48's third single, and the first major single released through DefSTAR Records, on October 25, 2006. The song is regarded as the signature song of AKB48, remains as AKB48′s most recognizable tune among the public, and is the theme song for their own TV show AKBingo!. They introduced "Senbatsu" system, choosing certain number of members to sing the A-side song out of entire members, first time, and the same system has been used until the latest singles.
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