Strong Feelings, Deep Emotion
noun
Feelings that make you sigh out loud are really strong feelings. You wouldn't sigh if they didn't move you so much.
かんがい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
感慨がこめられた彼女の歌声に感動しました。
I was deeply moved by the strong feelings in her voice when she sang.