The legendary drummer and the co-founder of Dream Theater, Mike Portnoy, celebrated his ex-bandmate John Petrucci‘s birthday by penning an open letter to him on Instagram.

As you may remember, a little while back, Mike Portnoy revealed their reunion with John Petrucci for the upcoming solo album of Petrucci, called ‘Terminal Velocity.’ It has been known so far that Portnoy plays the drums and Flying Colors’ Dave LaRue is on the bass on the album. You can see the details about the collaboration in our previous news.

After this duo shared the good news about their work and posted photos while making music together, Mike Portnoy recently took Instagram to celebrate his close friend’s birthday. He talked about his joy to work together with Petrucci again.

Here is what Portnoy said:

“Happy Birthday to one of my oldest friends who I met 35 years ago when we were both 18 years old…

I am so happy to have finally reunited this summer to play together again and I hope for more in the years to come! Happy Birthday John Petrucci.

You can see Mike Portnoy’s Instagram post below.