Robertson is the primary guitarist for the band, playing dominantly rhythm guitar (evenly split between acoustic and electric) on nearly all of the band's songs. Two of his three bandmates also play guitar with the band on certain songs (Kevin Hearn sometimes on lead, and Jim Creeggan occasionally playing rhythm guitar for songs he sings lead on). During his tenure with the band, Steven Page also played rhythm guitar and, occasionally, lead guitar on around a third of the band's songs. Robertson is capable of playing several other instruments including drums, pedal steel guitar, banjo and mandolin, but he rarely plays anything other than guitar, or occasionally 6-string banjo, on stage. On each passing album, he has sung lead on an increased number of songs, to the point where he shared approximately equal duty with Page by the time the latter left the band. Robertson has sung lead on a number of the band's singles since the success of 1998's "One Week", the first single released with a Robertson lead (not including "If I Had $1000000" which featured a Page/Robertson call-and-response lead vocal). He, along with his other bandmates, has taken over some of Page's lead and harmony vocal parts following the latter's departure. Robertson also often includes rapping and beatboxing into performances with Barenaked Ladies.