Songs that have stood the test of time.

If the test here is that the song invites reinterpretation, I'll nominate two from Todd Rundgren.  I love both songs and both reward a great voice:

Pretending to Care
Love is the Answer


Both have been covered to great effect many times - but Love still awaits the definitive interpretation IMO.

@martykl 

Todd Rundgren for sure!

Both great songs and DEFINITELY an artist I also considered. Can We  Still Be Friends or Hello It's Me. A song can be sappy and still be a great song. 

I like Star Spangled Banner covered by Carla Bley in minor key.

@czarivey 

I can't stream that song by Carla Bley. Isn't it some kind of anniversary for that song? BTW, I would be standing to listen to it. 

dbtom2, less-likely you will be able to stream that tune as it sounds more like funeral march (try to sing it out in minor key LOL) in other words, censorship blocks it anywhere it appears. 
The album is called European Tour 1977 and it’s available on vinyl and CDs at discogs