Kon, you make a terrific point in that final paragraph.
What I call "tags" are short vocal introductions employed to denote a song as being produced by a particular producer - J.R. Rotem, Timbaland, Darkchild, RedOne, etc. They can get a little obnoxious; it's rare to have a tag be perfectly consonant with the enveloping beat, and sometimes you just want to hear
the song, without having the incongruous information taking you out of the "listening zone". But in the world of pop music, tags serve a valuable purpose.
In rock music or folk music (and other genres, of course), it's reasonable to assume that an individual will be writing and performing their own songs. Pop, though, is structured around idiosyncratic vocalists, who often lack the musicianship or creativity for songwriting. It, then, marches to the beat of a different drummer. Pop performers (Jason DeRulo) sing songs ("Whatcha Say") that are usually written and/or produced by separate individuals (J.R. Rotem).* Thus, tags give the songwriter/producer the credit he or she deserves. They encourage us to think of pop songs as complex entities: pieces of art that are shaped by one artist and brought to life by another.
In contrast to the rock/folk mold, the soul and R&B music of the 60s, 70s and 80s laid the groundwork for the current pop system. Groups like the Temptations and Supremes infrequently wrote their own tunes; they had writing teams (a most notable one being
Holland–Dozier–Holland) churning out songs for them to perform. So, imagine if this kind of music had had such "tags" back in the day. For example, the entirety of Michael Jackson's
Thriller would be covered with "Q-Q-Quincy Jones" (or something similar). I'm not sure it would exactly change the course of musical history, but it would help us remember Quincy as much as we'll remember Timbaland.
* This is a very loose rule that isn't a rule at all. Performers' involvement in the songwriting/producing process really depends on genre. A rapper, if he desires any credibility, is going to write and perform a set of lyrics; but he'll rarely craft the beat that shall lie underneath these lyrics. An R&B singer may or may not write his own songs - there are many examples on either side of this coin. I think that pop singers, though, are the least autonomous.
An Extraordinary Example - Timbaland & Jay-Z, "Off That"Having just devoted a couple of paragraphs to tags, it's only fair to mention moments when a tag evolves into something more evolved - a dramatic prelude to a song... a proper introduction. "Off That", off Jay-Z's "Blueprint 3", exemplifies this.
Over a menacing hum of synth chords, it's Jay (the performer) and Timbaland (the producer) who proclaim, together: "Welcome... to the future." Then, it's a dialogue between the two minds...
Blueprint 3... hey heyHey, count me in. Find me a nice, soft place to land.
I got you, 'Hov!I'm so high up...
Yeah! Come on now.Find me a place to land.
Come on now! Come on now!Yeah... right there... yeah.
'Hov!By the end, we're at dramatic peak; we're truly ready to hear Jay launch into the first couplet. But firmly ensconced in our minds and ears is the concept of creative partnership. Jay's the one doing the rapping, but it's Timbaland who's "find[ing him] a nice, soft place to land". It's a poetic way of denoting the two respective roles. Oh - and of setting the stage for a kick-ass song.
Songs
Jason DeRulo - "Whatcha Say"
Jay-Z f. Drake - "Off That"