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This is the track name you are looking for: 光りあふれる揺りかごの中で

The prototype is CLANNAD game BGM: 町, 时の流れ, 人

You can refer to it The complete list of BGM for the first and second seasons in Baidu CLANNAD Tieba Collection

The post name is Organizing + Filling the Animation CLANNAD Academy Chapter & AS BGM List

Because the link address will be swallowed if you send it directly So I would like to trouble LZ to go to Tieba to search for it by yourself