Wikipedia claims, "It is possible that the kenosis passage in Philippians 2:5-11 may have been a Christian hymn that Paul quoted." If Paul is possibly not the author of this hymn, is there any evidence of the original author? All I've been able to find so far is that Stephen is a possible candidate; but I'm not sure what arguments are made for that position.
The passage in question is Philippians 2:5-11 (NET Bible):
The NET Bible note on the typesetting reads:
To me, the section looks very much like poetry and, if so, a song (or hymn). It's a compact and rhythmic summary of a complex idea. It's a passage to be memorized both because of the theological import and the flow of the words. (For instance, the repeated use of the word "name" in verses 9 and 10.)
Music has been a part of Christianity from the beginning Mark 14:26 (ESV):
Presumably hymns at that stage were composed much like modern song: a literarily-gifted person wrote the words and a musically-gifted person (perhaps the same person) wrote the music. With use, the words were likely to have changed to smooth out rough edges and fit more appropriately with the music. Hymns were certainly an oral tradition and rarely written down.
If it is a hymn, Paul probably would have expected the Philippians to be familiar with it or he would certainly have used his own words.
I haven't found a source that quotes the hymn separately from Paul. Origen directly attributed the passage to Paul:
It's interesting that he pulls out the passage in its entirety to make his point, but he doesn't call the section a hymn or suggest that it has a history before Paul.
Since Paul doesn't identify his source (or even designate the section as a hymn), anything we might say about the passage's author would be speculative at best. If Stephen has been identified as the author, it's likely to be wishful thinking more than any solid history. The only reliable source of the hymn is Paul and we can't trace it further back.