Here are some general guidelines:
* In formal writing: You generally don't put song titles in quotes unless you are referring to the song as a specific work (e.g., "The song 'Bohemian Rhapsody' is a classic").
* In informal writing: You can either put song titles in quotes or italicize them, depending on your preference.
* When mentioning a song within a sentence: You don't need to put the song title in quotes.
Examples:
* Formal: "The song 'Bohemian Rhapsody' is a classic."
* Informal: I love listening to "Bohemian Rhapsody" when I'm feeling nostalgic.
* Informal (italicized): I love listening to *Bohemian Rhapsody* when I'm feeling nostalgic.
* Within a sentence: "Bohemian Rhapsody" is a great song.
Ultimately, the best way to determine whether or not to put a song title in quotes is to follow the style guide of the publication or organization you are writing for.