The four Indian musical instruments mentioned in the crossword solutions are the tabla, SITAR, vina, and sarod. The tabla is a pair of hand drums that are used in North Indian classical music. The SITAR is a stringed instrument with a long neck and a gourd-shaped resonator. It is also used in North Indian classical music. The vina is a plucked string instrument that is used in South Indian classical music. Finally, the sarod is a fretless string instrument that is used in Hindustani classical music.