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This study investigated the effects of English songs on EFL undergraduate students’ speaking performance, with a specific focus on their speaking production in terms of lexical complexity, accuracy, and fluency, and explored the participants’ opinions on the use of songs in helping them to improve their speaking performance and gain confidence. The study employed a pre-experimental method with a one-group pretest and posttest design utilizing a speaking test to evaluate students' speaking performance. The tools were lesson plans integrating the use of songs in teaching speaking, questionnaire surveys, and a speaking test for the pretest, posttest, and delayed posttest. The participants comprised 28 first-year students studying English as a foreign language at a private university in Thailand. Data were analyzed using frequency, mean, standard deviation, and a pair-sample t-tests. The study revealed that: 1) The treatment had a positive effect on the learners’ speaking performance at the .05 level of significance between the pretest and posttest. Then the study analyzed students’ speaking tests to measure lexical density, accuracy, and fluency before and after using English songs in instruction. The findings reveal that while there was no significant change between the pretest and posttest scores, a statistically significant improvement in lexical density was observed in the delayed posttest. For the students’ speaking accuracy, the study found that students significantly increased their word count and pruned speech runs after the song-based instruction, indicating improved fluency and longer stretches of uninterrupted speech. 2) Students showed positive perceptions toward the use of songs in language teaching. They agreed that songs helped improve their speaking skills, which aligns with their higher scores in the posttest and delayed posttest. The findings of this study have pedagogical implications, encouraging language teachers to better understand the effects of using songs to promote students’ speech production.