The tumbi is a single-string instrument, a gourd with a stick and one wire, plucked with the index finger. It has no chords and no scale beyond what the player's finger finds on the string, and it can carry a whole song.
It is the instrument of the Malwa folk singer. Lal Chand Yamla Jatt made it famous and it went from there into bhangra, into Punjabi film music and eventually into recordings sold worldwide.
The algoze are twin beak flutes, played as a pair by one man using circular breathing so that the sound never stops, one pipe holding a drone and the other the melody. Learning to breathe for it takes years.
The chimta is a pair of iron tongs with jingles, a fire tool turned into an instrument. The dhad is the small hourglass drum of the dhadi. The bugchu, the kato and the sapp are all Punjabi noise-makers with fixed roles in dance.
None of these instruments requires anything a village did not already have. That is the point of all of them.
Neither instrument is taught anywhere formally. There is no notation for either, no examination syllabus, and no department in a Punjab university that offers them, and the transmission has always been from one player to a boy who sat beside him for years.
They are made by hand in a few workshops. The gourd is grown for the purpose and dried, the neck is tun or shisham, and the maker fits the wire and the peg by eye and by ear. Nothing about either instrument is manufactured.
Both are Malwa instruments and both are associated with the singers who worked the mela circuit. The algoze players left are very few and the tumbi has been absorbed into pop production.