。
She likes listening to classical music.
Literal
She [topic-は] classical music [object-を] listen-to [thing-of-のが] like.
A clean のが nominalization: the verb クラシック音楽を聴く ('listen to classical music') gets nominalized by の and made the subject of 好き with が — turning the activity 'listening to classical music' into a single 'thing' that can be liked. 聴く is the listen-with-attention kanji, contrasting with 聞く ('hear, listen' more generally) — 聴く is preferred for music, lectures, and any context where focused attention matters. クラシック (from English 'classic') has been clipped from クラシック音楽 to mean 'classical music' as a genre, parallel to ロック ('rock'), ジャズ ('jazz'), ポップ ('pop') as music-genre loanwords.