A basis for the organisation and classification of ragas depending on the notes used
Thaat:
Bilawal
Preferred time or season for playing
Time:
Early night
The most prominent note of a raga
Vadi
/
The second most prominent note of a raga
Samvadi:
, 
Categorization based on number of notes used in aroh and avaroh
Jati:
Containing 5 notes
Audav
-
Containing 7 notes
Sampurna
Do not follow strict ascending or descending order of notes
Vakra
Emotions evoked by the raga
Mood:
Shringar (Romantic)
Bihag is one of the most popular ragas of the early night. In this raga both and are omitted in
Ascending movement of notes
aroh
, but used in the
Descending movement of notes
avaroh
 as passing notes with no sustenance. Both forms of are used.
A natural note (corresponds to notes in Western major scale)
Shuddha
 is used often both in aroh and avaroh while
A sharp note
tivra
 is used in avaroh as /. Nowadays the extent of use of tivra has become more compared to older days. The earlier tradition was to use tivra as a
Note that is not part of the raga but used to enhance the presentation
vivadi
/
A note played for a short duration before the main note
grace
 note. Most of its phrases start from lower and phrases from all three octaves are used. This raga is suited for khyals and dhrupads but not for semi-classical.