This research examined the relationship between Thai prosodic words and musical note pairs, focusing on prominence matching and quantity matching. We hypothesized that the iambic structure of Thai disyllables would result in matching with more prominent musical positions and longer note duration. An analysis of 40 most frequently used disyllables from a 4,078,300 word corpus of Thai pop lyrics however revealed that prominence is not the main factor determining Thai textsetting. The sampled disyllables were found to match with initial prominence and final prominence note pairs roughly equally (48.8% v. 51.1%). On the contrary, quantity matching played a crucial role, with disyllables preferring to map to short-long note pairs (72.8%) especially at the end of musical phrases (92.2% of all phrase-final cases). Nevertheless, prominence matching plays a secondary role, resulting in the tendency of even disyllables to align with the prominence-final note pairs (76.8% of all even pair). This study thus demonstrates that, in contrast to previously studied languages, final stressed syllables in Thai prosodic words match with extended note quantity in textsetting, making musical prominence secondary. The importance of note quantity over musical prominence suggests the Iambic/Trochaic Law's role in the language-music interaction.