That's a subjective question! However, some iconic Tamil movie songs that are widely popular include "Vanna Vanna" from Bombay, "Chinna Chinna Aasaigal" from Moondram Pirai, and "Kalyana Parisu" from Nayagan.
Starting with the letter "A," we have timeless anthems. Tamil Movie Songs List A To Z
In the 1970s and 80s, song titles were literal (e.g., "Aadal Kalaiye" – The Art of Dance). By the 2000s, titles became Westernized ("Google Google," "Taxi Taxi"). Today, Anirudh has popularized single-word catchy titles ("Jalabulajangu," "Rathamaarey"). That's a subjective question