他的音乐风格最终融入了主流文化。

His musical style eventually became part of the ___mainstream culture.

这家电台主要播放主流音乐，而不是小众风格。

This radio station mostly plays ___mainstream music, not niche genres.

这种教学方法已被主流教育系统广泛采纳。

This teaching method has been ___mainstreamed into the education system.