Grammy winner Janelle Monae will contribute new music to the Disney Plus streaming title “Lady and the Tramp,” in addition to her voice role in the live-action reboot. Monae will perform two original songs for the film, led by Tessa Thompson and Justin Theroux. Monae’s artist collective Wondaland is also “reinventing” a track from the original 1955 animated movie, individuals close to the project said. That would be “The Siamese Cat Song,” originally recorded by Peggy Lee for the feline duo Si and Am in the animated version. Those characters and their famous refrain — “We are Siamese if you...