In music, a single, record single or music single is a type of release, typically a song recording of fewer tracks than an LP record, an album or an EP record. This can be released for sale to the public in a variety of different formats. In most cases, a single is a song that is released separately from an album, although it usually also appears on an album. Typically, these are the songs from albums that are released separately for promotional uses such as digital download or commercial radio airplay and are expected to be the most popular. In other cases a recording released as a single may not appear on an album. 

As digital downloading and audio streaming have become more prevalent, it is often possible for every track on an album to also be available separately. Nevertheless, the concept of a single for an album has been retained as an identification of a more heavily promoted or more popular song (or group of songs) within an album collection. 

Despite being referred to as a single, singles can include up to as many as three tracks on them. The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify. Any more than three tracks on a musical release or thirty minutes in total running time is either an extended play (EP) or, if over six tracks long, an album.
How many tracks can a single include?
What does the music industry signify a single as?
Is it released for sale?
To private bidders?
Who then?
Is it possible for every track to be available as a single?
What has the single concept been reserved for?
Anything else?
Who sells more digital music than anyone else?
How many songs with they take on a single?
How long can they be?
In total?
Does anyone else share this policy?
Who?
What is an album called that has 30 mins of songs?
What does that stand for?
What about over 6 songs?
Is a single released independent from the album?
Can it appear on the album as well?
Is it possible for every track on an album to also be a single?
In music, a single, record single or music single is a type of release, typically a song recording of fewer tracks than an LP record, an album or an EP record.
In music, a single, record single or music single is a type of release, typically a song recording of fewer tracks than an LP record, an album or an EP record.
a type of release
n music, a single, record single or music single is a type of release, typically a song recording of fewer tracks than an LP record, an album or an EP record. 
yes
This can be released for sale to the public in a variety of different formats. I
no
This can be released for sale to the public in a variety of different formats.
.the public
. This can be released for sale to the public in a variety of different formats.
yes
As digital downloading and audio streaming have become more prevalent, it is often possible for every track on an album to also be available separately. 
a more popular song within an album
 Nevertheless, the concept of a single for an album has been retained as an identification of a more heavily promoted or more popular song (or group of songs) within an album collection. 
a more heavily promoted song
 Nevertheless, the concept of a single for an album has been retained as an identification of a more heavily promoted or more popular song (or group of songs) within an album collection. 
Itunes
The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify.
Three
The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify.
less than ten minutes
The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each 
30 minutes
Any more than three tracks on a musical release or thirty minutes in total running time is either an extended play (EP) or, if over six tracks long, an album.
yes
 The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify.
Spotify.
The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as does popular music player Spotify.
an EP
Any more than three tracks on a musical release or thirty minutes in total running time is either an extended play (EP) or, if over six tracks long, an album.
extended play
Any more than three tracks on a musical release or thirty minutes in total running time is either an extended play (EP) or, if over six tracks long, an album.
an album
Any more than three tracks on a musical release or thirty minutes in total running time is either an extended play (EP) or, if over six tracks long, an album.
yes
In most cases, a single is a song that is released separately from an album, although it usually also appears on an album. 
yes
In most cases, a single is a song that is released separately from an album, although it usually also appears on an album.
yes
 it is often possible for every track on an album to also be available separately.