In Kathak, "abhinaya" is in the form of expressive gestures and pantomime set to music that usually outline a legend or the plot of a well known story. The gestures and facial expressions convey the "ras" (sentiment, emotional taste) and "bhava" (mood) of the underlying story. In the Hindu texts on dance, the guru and the artists successfully express the spiritual ideas by paying attention to four aspects of a performance: "Angik" (gestures and body language), "Vachik" (song, recitation, music and rhythm), "Aharya" (costume, make up, jewelry), and "Satvik" (artist's mental disposition and emotional connection with the story and audience, wherein the artist's inner and outer state resonates). A Kathak nritya performance, however grants flexibility to the artists and invites improvisation, and it may not be accompanied with a song or recital about the legend. The stories in Kathak performance generally tend to be about the Hindu god Krishna (or in some cases Shiva or Devi), and the stories come from sources such as the Bhagavata Purana, or the Indian Epics. This form of expressiveness is also found in "thumri" and Persian "ghazals".