Here is my analysis of 3 sentences from the song lyrics:
1. My life will never be the same cause girl, you came and changed
Locution: Declarative sentence in the future tense
Illocution: Expressive. The singer is expressing his feelings about how meeting this girl has changed his life.
Type: Expressive illocution according to Searle's classification.
2. Oh, oh, oh, oh, ooh, it feels so right I've searched for the perfect love all my life
Locution: Declarative sentences
Illocution: Expressive. The singer is expressing his feelings about how being with this girl feels right and she is the perfect