Why is the length of most songs about three and a half minutes?
user
I’m not sure, I haven’t paid attention to how long most songs are.  I might speculate that this length is more convenient for listeners to remember, so songs tend to end right before it is about to be too hard to remember them.
assistant
So, people get bored in that time and want something different?
user
Well, it’s certainly common for songs to have similar topics and style, with short refrains of lyrics or music.  This can be reminiscent of how the composer or performer learns to sing a song, but the form is also a very convenient way for a song to end.
assistant
Maybe that is the longest they can wait before airing a commercial on the radio?
user
That’s possible, but there are also other very common lengths, like a four-minute song with one or two different parts.  I could be wrong, but I believe there is no music industry regulation that would prevent the author from creating a song of any length, although I think the general acceptance of the three-minute song length is due to how convenient and recognizable it is.
assistant
So, it is just a formula they use?
user
Yes, it might be.  I don’t know any exact statistic, but I do believe it is one of the most common lengths for a song.
assistant
Why is the length of most songs about three and a half minutes?
user
I’m not sure, I haven’t paid attention to how long most songs are.  I might speculate that this length is more convenient for listeners to remember, so songs tend to end right before it is about to be too hard to remember them.
assistant
So, people get bored in that time and want something different?
user
Well, it’s certainly common for songs to have similar topics and style, with short refrains of lyrics or music.  This can be reminiscent of how the composer or performer learns to sing a song, but the form is also a very convenient way for a song to end.
assistant
Maybe that is the longest they can wait before airing a commercial on the radio?
user
That’s possible, but there are also other very common lengths, like a four-minute song with one or two different parts.  I could be wrong, but I believe there is no music industry regulation that would prevent the author from creating a song of any length, although I think the general acceptance of the three-minute song length is due to how convenient and recognizable it is.
assistant
So, it is just a formula they use?
user
There are many examples in different genres and styles of three-minute songs, I think.  In music which is less obvious to the listener, you may hear short-length songs with particular words that repeat frequently, like with rap music.  And of course, three-minute songs are always included on albums and recorded live by artists, so there are many examples of this length.
assistant
Why is the length of most songs about three and a half minutes?