Some of my favorite "aro songs" are :
Good thing by Zedd, Kehlani. The whole song is just so relatable to me but these parts especially :
"I've always been told, one day, I'll find Somebody who changes my mind If they come along, I won't think twice 'Cause I already got a good thing with me Yeah, I already got everything I need" I've been listening to it on repeat lately, it really helps me to be confident in being aro.
These 3 are more open for interpretation but I just love Mother Mother so I had to...
Alone and sublime by Mother Mother This part really resonated for me : "I wonder, did they make me right ? Aren't I supposed to wanna fight for love in life ?"
The knack by Mother Mother (this one might be controversial but personally I understand it as an aro who wants to fall in love but can't)
No one to nothing by Mother Mother (I personally understand it as feeling good by yourself)
Kalmia Kid by Chloe Moriondo, it's already been mentioned but I really love it.
Anyways, those are the songs I personally find the most relatable as an aro !