求翻译：On the evening of January 28th, 1985, forty-five singers made a historic recording. At 10 o’clock, every one sang part of chorus(合唱)and harmony(协调). At 4 the next morning, they started recording the solo vocal parts of the song. They finally finished recording at 8.是什么意思？

on the evening of january 28th, 1985, forty-five singers made a historic recording at 10 o 'clock, every one sang, part of the chorus (Chorus) and harmony (coordination) at 4 The the next morning, they started recording the solo The vocal parts of the song. they the finally finished recording at 8.