Talk about two musical heavyweights! The Eagles are currently on tour in the U.K. and Ireland through July, and Joe Walsh found time to sneak away to London to (as he says on Instagram above) "make some music with my old pal Brian." Brian of course referring to Brian Johnson, former and once again current (?) singer of AC/DC. Walsh went on to add "We nailed it! Love ya man!" Some are speculating the two were finishing a song they started when Walsh appeared on Johnson's A Life on the Road TV show back in May. You can see that clip below.