Learn Hardcore Korean: chimsireseo eumageul deureoyo. - I listen to music in the bedroom.

In Korean, -에 marks a static location (or “to” a place), while -에서 marks the place where an action occurs. Since you’re listening (an action) in the bedroom, you attach -에서: 침실에서.

Why is 듣다 conjugated as 들어요 rather than 듣어요?

듣다 is a ㄷ-irregular verb. When the verb stem ends in ㄷ and you add a vowel-initial ending like -아요/어요, that ㄷ changes to ㄹ.
So:
• 듣 + 어요 → 들어요

What is the function of 음악을, and why use -을?

음악 (“music”) is the direct object of 들어요. In Korean, direct objects take -을 if the noun ends with a consonant (or -를 if it ends with a vowel). Since 음악 ends in ㄱ, you use -을: 음악을.

Why isn’t there an explicit subject like “I” in the sentence?

Korean typically omits the subject when it’s clear from context. Here, it’s understood that the speaker means “I.” If you want to specify the subject, you can add 저는 or 나는:
• 저는 침실에서 음악을 들어요 (“As for me, I listen to music in the bedroom.”)

What politeness level is 들어요, and how can I change it?

들어요 is the polite informal style (해요체). You can switch levels like this:
• Casual/informal (친구): 들어
• Polite formal (합쇼체): 듣습니다
• Casual deferential (archaic/poetic): 듣노라

Is the word order flexible? Could I say 음악을 침실에서 들어요?

Yes. Because particles (-에서, -을) mark each word’s role, you can rearrange noun phrases for emphasis. Both:
• 침실에서 음악을 들어요
• 음악을 침실에서 들어요
are correct, with only a slight shift in what you spotlight.

How do I say “I listen to music in my bedroom” to show it’s my bedroom?

Add a possessive before 침실:
• Formal polite: 제 침실에서 음악을 들어요
• Casual/informal: 내 침실에서 음악 들어.