This research is a Classroom Action Research (CAR). The aims of the research are to: (1) find out the effectiveness of implementation of ABT in improving students’ vocabulary mastery at the fifth grade, and (2) identify to what extent ABT can improve students’ vocabulary mastery and give positive classroom situation. This research was carried out at SD Negeri Mojosongo III Surakarta in class VA in academic year 2016/2017. It was conducted in two cycles, from April, 25th 2017 until May, 26th 2017. Each cycle consisted of: planning, acting, observing, and reflecting. The data of research were collected through observation, interview, test, and field notes. It was found out some conditions that should be met in order to implement ABT effectively in the VA class. The first is the students are given an authentic song accompanied by music and movement. The second is the teacher have to maximally monitor the learning process, so that students could have adequate feedback. The third is the different kind of activities for used. The result of this research shows that: there was improvement in students’ vocabulary mastery. It can be seen from the result of total mean scores which increase from 66.24 in pre-test into 72.58 in post-test I and improve 79.35 in post-test II. The students were paying more attention to the lesson. They were more enthusiastic in joining teaching learning process. They participated during the lesson because most of students actively raised their hand to answer the researcher’s question willingly. In short, they were more motivated in learning English.