The OED cites an 1847 book as the first source of "number" to mean a musical performance, but doesn't indicate why that arose.
the 7 day theory
In the musical "Grease," Patty Simcox sings several songs as part of the ensemble cast. One of the songs she sings is "Summer Nights," where she participates in the group numbers with the rest of the cast. Patty also sings in other group songs such as "We Go Together" and "Greased Lightnin'." Patty's character is known for her bubbly personality and strong vocals in these ensemble numbers.
There are many places where one can find the total number of songs performed by the Rolling Stones. One can find this information on the bands Wikipedia entry.
As of October 2023, George Strait has achieved 44 number one songs on the Billboard Hot Country Songs chart. This record makes him one of the most successful country artists in terms of chart-topping singles. His career spans several decades, and he is often referred to as the "King of Country."
It's impossible to figure out the numbers of song written over time.
There are literally dozens of songs.
The Book of Psalms.
It is referred to as a format.
yes
When it is not included in the natural numbers, it is referred to as 'the natural numbers with zero'.
They are referred to as 'TV Show Tunes'.
Psalms 120-134 are referred to as Songs of Ascents.
The hymn numbers for the songs to be sung during the upcoming church service are 145, 267, and 402.
They are often referred to as ordinal numbers (because they refer to the order in which things appear) and are contrasted with cardinal numbers, which exist in their own right - for example, three, five, ten.
a name referred to in several songs of the band Sonata Arctica's music.
A "close corporation"
The 'mean'.Also often referred to as the 'average'.