2017-03-29: Guia completo para todas as canções que PM e Costello escreveram

http://people.com/music/paul-mccartney-elvis-costello-song-collaboration-guide/

2017-03-22: Elvis Costello fala da colaboração com PM

O álbum conjunto dos dois nunca saiu, mas a reedição do Flowers in the Dirt traz 9 versões acústicas usadas por um ou por outro a solo e duas músicas não utilizadas:
http://www.esquire.com/entertainment/music/a54015/elvis-costello-interview-paul-mccartney-flowers-in-the-dirt/

Citação:
"But this week's reissue of McCartney's 1989 return-to-form Flowers in the Dirt, in pricey but spectacular deluxe and expanded form, includes a bonus disc of acoustic demos of nine songs by the pair, another disc of fully realized studio recordings amounting to the album that never was, and bonus downloads of an additional track, plus three rough and ready cassette recordings made in 1987—which will also be released for Record Store Day as a three-song cassette—in essence rewrites history.

"As to whether a record should come out, it has," Costello tells me, in his first ever in-depth interview about his songwriting partnership with McCartney. "This is it.""

2013-03-17: PM e Elvis Costello falam da sua colaboração

Entrevistas (separadas):
https://www.washingtonpost.com/entertainment/music/after-john-paul-mccartney-found-another-partner-to-get-the-most-out-of-him-the-proof-is-finally-emerging/2017/03/16/ae2fe91c-09a7-11e7-a15f-a58d4a988474_story.html?utm_term=.036fd81cda96

2017-03-14: PM e Elvis Costello recordam gravações de Flowers in the Dirt

http://www.rollingstone.com/music/features/inside-paul-mccartney-and-elvis-costellos-eighties-team-up-w471411

Citando:
"Songwriters look back on their spectacular 'Flowers in the Dirt' sessions, out soon in a deluxe box set"