Sohni is a raga in Hindustani classical music in the Marwa thaat. Alternate transliterations include Sohani and Sohini. Like Bahar, it is a small raga, with not much space for elaboration. It emotes the feel of longing, of passive sensuousness.
The raga is of audav-shadav nature, i.e., it has five swaras (notes) in the arohana (ascent) and six in the avarohana. Rishabh (Re) is komal (half step DOWN from natural) and Madhyam (Ma) is Tivra (half a step UP from natural), (denoted below by Re(b) and Ma#), while all other swaras are shuddha. Pancham (Pa) is not used.
Arohana: Sa Ga Ma# Dha Ni Sa.
Avarohana: Sa Ni Dha, Ga Ma# Dha Ga Ma# Ga Re(b) Sa.
Pakad: 1. Sa Ni Dha, Ga Ma# Dha Ga Ma# Ga. 2. Sa Ni Dha, Ni Dha Ga Ma#, Ga Ma#, Ga Re(b) Sa.
The vadi swara is Dha, and samvadi is Ga. The rishabh is weak, but Gandhar (Ga) is strong, unlike Marwa. It is an Uttaranga pradhan raga, with the higher notes on the saptak (octave) being used more frequently.
Raga Sohni is associated with very late night / pre-dawn, the last or eighth period of day, roughly from 3-6AM.
It is somewhat similar to Marwa and Puriya ragas in the same thaat, and also to Basant in the Poorvi thaat.
Hamsanandi is a rāgam in Carnatic music that resembles Sohni.