History of Western Vocal Training

Formal Western voice training traces back to the bel canto ('beautiful singing') tradition that developed in 17th-century Italian opera, built around breath control, tone and agility across a singer's full range. That technical foundation still underpins classical and musical-theatre training today.
The microphone changed everything for popular singing in the 20th century. Before amplification, a singer had to physically project to fill a hall; the microphone let singers like Bing Crosby 'croon' intimately instead, opening the door to the conversational, close-mic vocal styles that define pop, R&B and jazz singing now. Recording technology then let vocal performances be layered, tuned and polished in ways live performance never allowed, giving rise to entirely new production-driven vocal aesthetics.
Modern vocal training blends both worlds: classical breath support and tone control as the technical base, applied across whatever contemporary style a singer actually wants to perform. That is why a good vocal program teaches the fundamentals first, regardless of which genre a student ultimately gravitates toward.