Answer:

The raga that is traditionally sung late in the night is Raga Darbari. This raga belongs to the Hindustani classical music tradition and is associated with the late-night hours, creating a deeply meditative and introspective mood.

Explanation:

Ragas are melodic frameworks used in Indian classical music, comprising of a specific set of notes, melodic patterns, and ornamentations. Each raga has its own unique character and is associated with a specific time of day or season.

Raga Darbari:
Raga Darbari is one of the most important ragas in Hindustani classical music. It is traditionally performed during the late-night hours, typically from midnight until dawn. The name "Darbari" is derived from the Persian word "darbar," which means court or palace, indicating its association with royal or majestic settings.

Characteristics of Raga Darbari:
- Raga Darbari is characterized by its slow and contemplative pace, allowing for deep exploration of each note and melodic phrase.
- It is primarily based on the Kafi thaat, which provides a framework for the melodic structure of the raga.
- The notes used in Raga Darbari are: Sa, Re, Ga, Ma, Pa, Dha, and Ni. However, the emphasis is on the flat or Komal Re (lowered second note) and flat or Komal Dha (lowered sixth note), giving it a unique melancholic and introspective quality.
- The raga is usually performed in the lower octaves, creating a rich and resonant sound.
- The use of meends (glides), gamaks (grace notes), and alankars (ornamentations) adds depth and complexity to the melodic improvisations.

Emotional and Spiritual Significance:
Raga Darbari is known for evoking a range of emotions, including longing, yearning, and introspection. Its late-night performance enhances its introspective and meditative qualities, allowing listeners to delve into the depths of their emotions and connect with their inner selves.

The performance of Raga Darbari is considered a profound spiritual experience, as it encourages deep contemplation and introspection. The slow and measured improvisations in this raga provide ample space for the artist to express their emotions and explore the various nuances of the raga.

In conclusion, Raga Darbari is traditionally sung late in the night due to its deeply meditative and introspective nature. Its performance during these hours creates a unique atmosphere, allowing listeners to immerse themselves in its beauty and experience a profound spiritual connection.