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> この部屋は図書室です。本やCDを借りたり、宿題をしたり出来ます。日本語の本が２０００冊あります。外国語の本は１０００冊あります。CDは５００枚あります。CDを聞くときはヘッドホンを
> **しましょう** 。友達と話すときは小さい声で話すように **しましょう** 。

Why do we have to use the ～ましょう form here instead of just using the ～ます form?
If I understand everything correctly than ヘッドホンをしましょう means "Let's put on the
headphones." or "I will put on the headphones". But here we want to say "When
I listen to the CD I put on my headphones", so why using ～ましょう？

Also I don't really get the 話すようにしましょう construction here. How can I translate
this properly?
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verbs volitional-form
Why is ～ましょう form used in the following situation?
If you use ～ます (called スル形 in Japanese linguistics papers), in this context,
you'll be stating a fact or describing a situation as opposed to making a
suggestion.

> CDを聞くときはヘッドホンをします。友達と話すときは小さい声で話すようにします。

Standalone, without more context, this sounds like the speaker is talking
about how they do these things: they make sure to put on headphones when
listening to music and keep their voice down when they talk to their friends.

Of course you can make that a suggestion without invoking ～しよう(～ましょう):

> 友達と話すときは小さい声で話してください。

> 友達と話すときは小さい声で。

> 友達と話すときは小さい声でお願いします。

> 友達と話すときは小さい声で話しなさい。

You can use こと to give a command/suggestion if you want to use the verb in
スル形, but in doing so you risk sounding a bit bossy and peremptory.

> 友達と話すときは小さい声で話すことです。

Now, back to your title question,: why is ～ましょう (シヨウ形) used here?

シヨウ形, or volitional form as it's called in Japanese grammar in English, is
often used to give instructions by teachers or similar figures of authority.
This usage is referred to as 遠回しな命令 (indirect commands) by some Japanese
linguists. (See, for example, 山下由美子. "「しよう」「しようか」 の意味・用法: 日本語教育への提案."
創価大学大学院紀要= The bulletin of the Graduate School, Soka University 33 (2011):
299-327.)

A teacher may say to the class: 「みなさん、静かにしましょう」 And this is why the volitional
is commonly used by teachers, guardians to give instructions to
children/students.
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