高中英语句子分析？

The first time 状语，that rap artists recorded their music 定语从句，修饰the first time。定语从句中：that 关系副词作状语，rap artists 主语，recorded 谓语， their music 宾语。主句是musicians recorded the backing tracks in the studio and the rappers added their vocals later. 主句是用and连接的两个并列句子，第一分句中: musicians 主语，recorded 谓语，the backing tracks 宾语。第二分句中：the rappers 主语，added 谓语，their vocals 宾语，later 状语。

the first time that在这里合适，that可以省略。
但是如果用when引导的话，就不太合适了。
the first/last time (that) 就是引导状语从句的，表示时间。

常见结构：This/It is the first time that+从句。