Breakdown of imouto wa neru mae ni iyahon de ongaku o kiki nagara, shousetsu o yonde iru.
Questions & Answers about imouto wa neru mae ni iyahon de ongaku o kiki nagara, shousetsu o yonde iru.
で here marks the means or tool used to do an action.
- イヤホンで音楽を聞く
= to listen to music *with earphones / *using earphones
In English we’d use with or using. In Japanese, で covers that meaning.
Other examples of で as “by / with / using”:
- 箸で食べる – eat with chopsticks
- ペンで書く – write with a pen
- バスで行く – go by bus
Using を with イヤホン would turn earphones into the direct object (the thing you’re listening to), which is wrong here—she’s not listening to earphones, she’s listening to music using earphones.
