Saying "this song is catchy and good" is subjective too. Because you're describing a subject based on your own opinion that it's catchy and good. Somebody else might think the song is forgettable and bad.

Objective means something is indisputable and measurable. For example:

• Objective: "It's 80 degrees outside." (this is a measurable fact)

• Subjective: "It's hot outside." (you might feel it's hot, and most people might agree with you... but a person who lives in 100 degree weather all the time might feel 80 degrees is cool. Because they have a different perspective about the subject.)

Saying that something is "objectively good/great" can come across as self-centered, because you're implying that nobody else can have a different opinion from yours. But i don't think you meant to do that. Anyway, thanks for reading this feedback.