The capacity to sustain an internal sense of pulse, referred to as the beat in music, is critical for various rhythmic musical behaviors and is related to language processing in humans. Prior work has provided ample evidence that the brain's motor system is active musical rhythm perception, even if the participant is not moving. However, recent work has suggested that while some musical rhythm tasks may measure beat-based rhythm processing, other musical rhythm tasks may rely more on other executive functions, such as short-term memory. In this study, we used transcranial direct current stimulation (tDCS) to either excite or inhibit two cortical areas of interest while healthy adult listeners performed two rhythm tasks: the Beat Alignment Test (BAT) and a rhythm reproduction (RR) task. We hypothesized that modulating brain activity via tDCS in the supplementary motor area (SMA) will affect beat-based rhythm perception (BAT), while modulating brain activity in the right supramarginal gyrus (right SMG) will affect sequence memory-based rhythm perception (RR). This study causally compares the roles of these neural areas in human performance on multiple commonly-used rhythm tasks. Our findings to-date suggest no evidence for a clear distinction between beat-based and sequence-memory based rhythm competencies, although limitations and future experiments will be discussed.