Question

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Historically, fewer than twenty percent of the pop songs identified by music executives as likely to be hits have performed as expected.

Answer 1

从过去的情况来看，被音乐人看好大卖的流行歌曲，只有不到20%会真正畅销。

句子的主干为
fewer than wtenty percent of the pop songs have performed as expected.

Answer 2

从历史上看，那些被音乐公司老板看好会走红的流行歌曲中，真正能一炮打响的还不到20%。

Answer 3

从历史上来看，音乐公司选中的流行音乐里，只有不到20%的达到了预期效果。