New Delhi, April 8 -- On July 8, 1989, a young music fan named Aadam Jacobs, with a compact Sony cassette recorder in his pocket, went to see an up-and-coming rock band from Washington for their debut show in Chicago.

After a blast of guitar feedback, 20-year-old Kurt Cobain politely announced to the crowd at the small club called Dreamerz: "Hello, we're Nirvana. We're from Seattle." With that, the band, then a quartet, launched into the riff-heavy first song, "School."

Jacobs surreptitiously recorded the performance, documenting the fledgling band in raw, fiery form more than two years before Nirvana's global breakthrough with the album "Nevermind."

Jacobs went on to record more than 10,000 concerts, with increasingly sophisticated eq...