In the church modes of Gregorian chant the reciting tone (also dominant, tenor, tubae) is the melodic formula used for reciting psalm tones. Each mode had its own associated psalm tone, the tenor of which is the reciting tone. (Hoppin 1978, p.67) Gregorian chant is also known as plainchant or plainsong, and is a form of monophonic, unaccompanied singing, which was developed in the Catholic church, mainly during the period 800-1000. ...
The tuba is the tone, repeated according to the number of syllables of the half-verse, on which the main part of the text is sung.
Tones I, through VIII are the classical "Eight Psalm Tones." The versions of the tones given here is those commonly used in German Lutheranism since the time of the Reformation.
"Irr." is the Tonus Irregularis, the "irregular tone."
In chant, a recitingtone (also called a recitationtone) is a repeated musical pitch around which the other pitches of the chant gravitate, or by extension, the entire melodic formula that centers on one or two such pitches.
Recitingtones occur in several parts of the Roman Rite.
In addition to the eight psalm tones associated with the eight musical modes, there is a ninth psalm tone called the tonus peregrinus, or ""wandering tone," which uses a recitingtone of A for the first part of the psalm verse and a G for the second half.