Sammy posted a black and white picture of EVH strumming his guitar while in mid-air and his long hair flailing away. Sammy, who was part of the "Van Hagar" era from 1985 to 1996, said, "I can't believe it's been a year. The man is gone but the music lives on #forever."

Eddie's widow, Janie, also posted a touching tribute saying she thinks about EVH every single day. She said among the things she misses the most ... his smile, laugh and kindness.

Janie added, "I miss this, I miss us, I miss you, and I try my best to carry on the way you would want me to. But my Peep, some days, that's really hard to do. This will never get easier because there really is no getting over you."

TMZ broke the story ... Eddie died following a long battle with cancer. He died at a Santa Monica hospital with Janie and his son, Wolfgang, by his side. Eddie's ex-wife, Valerie Bertinelli, and Eddie's brother/drummer, Alex, were also by his side.

Speaking of Wolfie ... he also posted a picture on Instagram during a guitar sesh with his dad. Wolf wrote, "You fought so hard for so long, but you were still taken away. It’s just so unfair."