sentence: as with the rest of kala , m.i.a. and co-composer switch relied heavily on logic pro , a digital audio workstation produced by apple , and were able to capture vocals and background sounds outside the traditional studio environment , using a microphone and a macbook pro . consisting of urumee drum percussion , trumpets , tambourine , electronic scratches and synths , the song 's instrumentation also consists of repetitive pumped-up synthesizer and 4/4 beats .