"Nirvanna the Band the Show" is indeed a series that aired in 2016 on Viceland. This Canadian mockumentary-style television series is an ingenious piece of comedic genius, combining elements of improvisation, fiction, and reality to create a truly unique viewer experience. It revolves around the hijinks of two best friends and bandmates, Matt Johnson and Jay McCarrol, ambitiously striving to get their band, known as "Nirvanna the Band," a gig at The Rivoli, a small bar in Toronto.

Utilizing a unique structure that blends scripted narratives and improv with real-life interactions with unsuspecting people, the show continually breaks the fourth wall, introducing a distinctive style of docufiction that lashes together elements of reality television and scripted sitcoms. The result is a brilliantly frantic, edgy comedy that keeps viewers on their toes, unable to tell where the line between reality and fiction truly lies.

Both Johnson and McCarrol, who co-created the show, play fictionalized versions of themselves, taking on the lead roles. These personas are portrayed as hapless yet endearingly ambitious musicians, naiively confident in their quest to book a show at the pivotal Rivoli. What's intriguing is the fact that neither of them seem to spend a lot of time on practicing or making music; instead, their energy is almost entirely devoted to the creation and execution of various often-outrageous schemes they believe will access them the sought-after gig. They dream big despite exhibiting little talent, yet it's this very reality distortion, meshed with their heartwarming friendship and combined personalities, that is the core of the show's appeal.

Matt is the reckless, audacious ideas man, often dragging Jay, the comparatively cautious and worrisome one, into his elaborately detailed plans. This balance between their character dynamics adds a charming essence to the narrative, keeping the energy continuously on the move.

The show includes an interesting amalgamation of cultural references, from films and video games to popular music, which not only play a crucial part in the plot but also serve as a nostalgic throwback for viewers. These references aren't just built into the dialogue; they sometimes bleed through the fabric of the show itself, with the duo reenacting scenes from films or utilizing music scores to enhance comedic timing.

"Nirvanna the Band the Show" also utilizes Toronto as a character in itself, portraying the city as a vibrant, living entity full of eccentric characters and unique locales. The city’s diverse tapestry adds an alternating backdrop that lends the series an additional layer of depth. This choice of setting thus offers a refreshing authenticity that enhances the overall spontaneity of the show.

It’s important to mention that the series initially started as a web series before catching the attention of the right people and landing a slot on Viceland. The TV series maintained the concept and humor from its web-based predecessor, ensuring continuity for the initial fan base while offering an introduction to new viewers.

Audiovisually, the series has a hand-held, rough-around-the-edges feel, which complements its fast-paced energy and impromptu style. Its musical score, both diegetic and non-diegetic, play a significant role within the narrative, adding an additional layer of comedic timing and entertainment value.

In conclusion, "Nirvanna the Band the Show" isn't just another sitcom or typical comedy series on television. It’s an innovative, bold, and witty show that brilliantly experiments with the art of performance, the boundaries between scripted fiction and improvisation, and the divide between the audience and performers. Despite the characters’ delusional ambitions, their vibrant enthusiasm with life, underlined by their strong bonds of friendship, crafts a warm and engaging narrative that deepens the show beyond its comedic exterior. For those who enjoy quirky, out-of-the-box comedy with a refreshing twist, this show is a hidden gem waiting to be discovered.