The background of the study in this research is based on the phenomena that there were some students face difficulties in vocabulary, less of students had motivation in learning activity because teaching learning process was not satisfied and less of students’ vocabulary power especially in irregular verb. There is one method used in teaching English, the method is Mim-Mem (Mimicry-Memorization). To collect the data, the researcher used several methods: observation, test, and documentation. The analysis of data method was used to support the research at the school to get the purpose of the research. The design of this study is a CAR with purpose to promote students' vocabulary power in irregular verb through song. This research was conducted in two cycles and was done in three activities including the pre cycle with four activities in each cycle they are: planning, observing, acting and reflecting. The result of study shows that using Song as the media can improve students’ achievement in learning irregular verb. In this research, the researcher took a test of the students’ achievements in each cycle. This is proved by students’ test that improved in every cycle. In the pre cycle, the average of the students’ achievement was 6.01. In the first cycle the students got 7.23 and in the second cycle the students got 8.08. Result of the research can be concluded that the use of Song as the realization of Mimicry-Memorization to promote Students’ Vocabulary Power in irregular verb was successful.