When it comes to the phrase "sung same old song", synonyms abound. Some alternatives to this expression might include "repeating the same tired tune", "recycling old material", or "stuck in a rut". Other options include "stale and tired", "uninspired and unimaginative", or "predictable and boring". In short, any phrase that communicates a sense of repetition or lack of originality can be used as a synonym for "sung same old song". Of course, the key is to choose a phrase that best fits the specific context and tone of the situation.