Genre: Dendang Solok
The bansi was used to accompany dendang from the Solok region, like Ratok Solok or Cupak Maambiek Lado. Philip Yampolsky included two songs played on the bansi on Night Music from West Sumatra (1994).
The tradition of using this flute to accompany this repertoire has mostly passed out of practice in deference to the saluang darek. Instead, tunes originating in the solok region, the dendang solok, have been incorporated into the more mainstream practice of saluang darek, with aesthetic changes in the process, most noticeable in tuning, range, and timbral differences between the flutes.
Here is "Cupak Maambiak Lado" on the bansi
You can hear an example of that tune transformed to saluang darek: