見える・聞こえる
can be seen, can be heard
Thing + が + 見える / 聞こえる
Sign up free to review this point on a spaced schedule.
見える and 聞こえる say that something is visible or audible, that it reaches your eyes or ears by itself: 窓から海が見えます, "you can see the sea from the window"; 音楽が聞こえます, "I can hear music".
Compare the potential forms 見られる and 聞ける. Those are about being able to see or hear something because you have the chance: この映画はネットで見られます, "you can watch this film online"; ラジオで聞けます, "you can listen on the radio".
So a view or a noise is 見える / 聞こえる; a film, a concert or a show you can get to is 見られる / 聞ける.
Both take が for what's seen or heard, and both are ichidan verbs: 見えない, 聞こえました.
Examples
窓から海が見えます。
You can see the sea from the window.
隣の部屋から音楽が聞こえます。
I can hear music from the next room.
暗くて何も見えない。
It's so dark I can't see anything.
すみません、よく聞こえません。
Sorry, I can't hear you very well.
ここから富士山が見えますか。
Can you see Mount Fuji from here?