Paganini Horror

At La Casa di Sol, an ancient Venezian home of various composers through the ages, a young violinist practices a piece by Paganini and then inexplicably electrocutes her bathing mother with a hairdryer.
A female rock band recording in a studio are told by their manager, Lavinia, that they should find a new song. The drummer, Daniel, travels to meet with a Mr. Pickett, who sells him an unpublished score by Paganini. Daniel demonstrates the new piece, "Paganini Horror", for Lavinia and the lead singer, Kate, with all three agreeing to record it. Lavinia suggests they employ famed horror director Mark Singer to film a video and Kate suggests they film at La Casa di Sol, with Lavinia adding that she knows the current homeowner, Sylvia.
During the video shoot, Sylvia reveals the legend that Paganini himself once resided in the house and murdered his bride, Antonia, there. Meanwhile, Pickett travels to St Mark's Campanile, where he throws the money Daniel gave him off the roof and invokes Paganini's curse.
Rita, the bass player, is confronted by Paganini, whom she assumes is Daniel wearing his costume from the video shoot; however, he stabs her to death with a violin. Sylvia and the guitarist, Elena, announce that Rita has vanished; Lavinia suggests she be replaced, while Mark suggests they finish the video using mannequins. While going to collect the mannequins, Daniel sees Rita and is summoned by her to another room, where Paganini murders him.
Sylvia finds Daniel's ring amongst ash and they decide Daniel has played a joke on them when the ground opens beneath Kate and she falls. As Mark tries to help her out of the hole, he is electrocuted and drops Kate into the hole. Mark and Elena are driven from the house by deafening sounds, but when they try to escape, their car hits an invisible barrier, ejecting Elena from the car and engulfing it and Mark in flames. Lavinia finds a tunnel in the hole and descends to try and locate Kate. Elena and Sylvia hear Lavinia scream, but Elena believes the scream came from upstairs, leading Sylvia to investigate.
Sylvia, hearing ghostly violin music, ascends the stairs and sees Daniel outside in the courtyard. After quickly exiting the house to greet him, she finds he has vanished and discovers a bewildered Kate in the empty courtyard pool. The two agree to find the others and escape.
Lavinia emerges from the hole and reunites with the others, realizing Elena has gone missing. Following a trail of blood, they ascend the staircase and find a dying Elena covered in blood. Lavinia recognizes fungus on Elena and says it was found on logs during the 18th century, with the wood being used to make Stradivarius violins. Kate resolves that the only way to rid the house of the curse is to use Paganini's piece as a weapon and plays it on her violin. However, when they attempt to escape the house, they find that the invisible barrier is still in place.
Kate decides the curse could be lifted by playing the piece backwards, but when Kate attempts this, the sheet music electrocutes Lavinia and bursts into flames. Lavinia is then trapped behind an invisible wall and crushed to death. Paganini emerges, stabbing Sylvia with his violin and sealing the unconscious Kate in an empty double bass case. As he plays his violin, Kate awakens inside the case, which catches on fire. The sun rises and emerges through the open window, reducing Paganini to dust and incinerating the sheet music.
Kate exits the house as Sylvia, thought to be dead, arrives by car and explains that, because Kate never played the piece backwards, Paganini's curse will continue. Pickett emerges from the car as Sylvia explains that she was the one who, as a child, murdered her mother in the house, and that she was condemned to relive the experience they just went through eternally. Pickett further explains that all visitors to the house have been condemned to Hell. As a new family arrives, Kate thinks she is free to go, but Pickett explains that he hates people who sell their souls for fame and success and stabs her to death.