3.The first time that rap artists recorded their music, musicians recorded the backing tracks ...

说唱艺术家初次录制音乐时，演奏师先录制背景音乐...... the first time ..."第一次......时"，that引导定语从句，修饰time，此时that常可省略。 The_first_time_I_went_to_China,_I visited Beijing.

我第一次去中国时，我就参观了北京。 　　

　　1．(教材P44)The percussion breaks were usually short, but Herc and other DJs made them longer by using two records on two turntables, side by side.

　　这些打击乐通常很短，但埃尔克和其他音乐主持人利用摆放在一起的两个唱盘将两盘录音反复播放，使打击乐播放时间更长。

　　side by side 并排；并肩

　　shoulder to shoulder　　　　 肩并肩，紧挨着

　　hand in hand 手拉手，形影相随

　　neck and neck 并驾齐驱，齐头并进

　　arm in arm 臂挽臂

　　face to face 面对面

　　back to back 背靠背

　　heart to heart 心连心

　　①We've worked side by side for years.

　　我们已并肩工作有好多年了。

　　②They were walking along the bank shoulder to shoulder.

　　他们正肩并肩沿着河岸散步。

　　③Theory and practice should go hand in hand.

　　理论应当结合实际。

　　④They stood face to face, staring at each other.

　　他们面对面地站着，互相凝视着对方。

　　[名师点津]　在"n.＋prep.＋n."搭配中，名词前都不用冠词。

　　2．(教材 P44)Later, they experimented with different vocal and rhythmic approaches ...

　　后来，他们尝试用不同的发声和奏乐方法......

　　approach n．方法，步骤；靠近，接近；路径，道路 v．靠近，走近

　　(1)the approach to (doing) sth.

　　　　　　　　　 (做)......的方法/途径

make an approach to sb.