A popular Toronto pizza restaurant that spawned a fruitful chain is about to totally change up its concept.As far as local pizza empires in Toronto go, you won't get far in listing them before you land on Pizza Libretto. Founded by Max Rimaldi and Rocco Agostino as a standalone location on Ossington back in 2008, the restaurant's bread and butter (so to speak) was Neapolitan-style pizza, which quickly clawed its way up the ranks of the city's favourite slices.18 years, three additional locations and a bountiful frozen pizza business later, and Pizza Libretto is still going strong, but in the case of the chain's original Ossington location, change is afoot.Starting Friday, Feb. 20, Pizza Libretto Ossington will reintroduce itself to the city as Bar Libretto, a new bar concept that eschews the lengthy menu the restaurant's legacy was built on, opting instead for a more condensed culinary offering.Open Wednesday through Saturday, 4 p.m. on, the focus at Bar L...