AC/DC singer Brian Johnson has been making music with EAGLES guitarist Joe Walsh.

One day after the EAGLES' sold-out June 23 show at London, England's Wembley Stadium, Joe took to his Instagram to post a photo of him with Johnson, writing in an accompanying caption: "Great day making music with my old pal Brian today in London. We nailed it! Love ya man!"

Walsh did not offer any more information about the collaboration, but some fans have speculated that the rock legends were recording the impromptu song they created when Walsh appeared in an episode of Brian's TV series "A Life On The Road" earlier this year. The show saw Johnson and Walsh riding a limo around some of Los Angeles's most important music spots and Joe reflecting on his early days in the JAMES GANG and subsequent career with the EAGLES.

The news of Johnson's latest musical activity comes less than a year after he and AC/DC drummer Phil Rudd, along with guitarists Angus Young and Stevie Young, were photographed outside Vancouver's Warehouse Studios last August. Based on the pictures, the assumption is that AC/DC is in the midst of making — or at least planning — another album, with Rudd and Johnson both back in the lineup. Online reports have also indicated Angus Young will dedicate the new AC/DC album to his late brother.

Ever since AC/DC completed the tour cycle for its 2014 album "Rock Or Bust" three years ago — a turbulent trek that weathered the forced retirement and eventual death of co-founder Malcolm Young, plus the departures of Johnson, Rudd and bassist Cliff Williams — fans have wondered whether sole remaining founding member Angus Young would keep the band going or decide it was time for AC/DC to pack it in.

Johnson was forced to leave AC/DC mid-tour due to a dangerous level of hearing loss, and was eventually replaced on the road by GUNS N' ROSES frontman Axl Rose, while Williams decided to retire at the end of the cycle.

This past February, a photo surfaced on social media suggesting that Williams has also returned to AC/DC and will appear on the rumored comeback album which is expected to be released in the coming months.