With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mike Portnoy was replaced by Mike Mangini in Dream Theater.
text_B: Michael Stephen `` Mike '' Portnoy -LRB- born April 20 , 1967 -RRB- is an American drummer primarily known as the former drummer , backing vocalist , and a co-founder of the progressive metal / rock band Dream Theater .. Dream Theater. Dream Theater. backing vocalist. backing vocalist. progressive metal. progressive metal. rock. progressive rock. Known for his technical skill as a drummer , Portnoy has won 30 awards from the Modern Drummer magazine .. Modern Drummer. Modern Drummer. magazine. magazine. He co-produced six Dream Theater albums with guitarist John Petrucci , starting from Metropolis Pt .. Dream Theater. Dream Theater. produced. Record producer. John Petrucci. John Petrucci. 2  : Scenes from a Memory through Black Clouds and Silver Linings .. Black Clouds and Silver Linings. Black Clouds and Silver Linings. From A Change of Seasons onwards , Portnoy had been writing a significant amount of Dream Theater 's lyrics .. Dream Theater. Dream Theater. A Change of Seasons. A Change of Seasons. He is the second youngest person -LRB- after Neil Peart -RRB- to be inducted into the Modern Drummer 's Hall of Fame , at 37 years of age .. Modern Drummer. Modern Drummer. Neil Peart. Neil Peart. Hall of Fame. Hall of Fame. Besides his work with Dream Theater , Portnoy is known for his many side projects and tribute bands .. Dream Theater. Dream Theater. He is a founding member of Liquid Tension Experiment , an instrumental progressive rock band featuring fellow Dream Theater members John Petrucci and Jordan Rudess along with bassist Tony Levin .. progressive rock. progressive rock. Dream Theater. Dream Theater. Liquid Tension Experiment. Liquid Tension Experiment. rock. progressive rock. John Petrucci. John Petrucci. Tony Levin. Tony Levin. He is also a founding member of Transatlantic , a progressive rock `` super-group '' featuring former Spock 's Beard keyboardist / vocalist Neal Morse , Flower Kings guitarist Roine Stolt and Marillion bassist Pete Trewavas .. progressive rock. progressive rock. Transatlantic. Transatlantic ( band ). rock. progressive rock. Neal Morse. Neal Morse. Flower Kings. Flower Kings. Roine Stolt. Roine Stolt. Marillion. Marillion. Pete Trewavas. Pete Trewavas. Portnoy has also recorded and / or toured / performed live with Neal Morse , OSI , Hail !. OSI. OSI ( band ). Neal Morse. Neal Morse. , Stone Sour , Fates Warning , Overkill , G3 and played on Avenged Sevenfold 's album Nightmare in place of their late drummer , The Rev. Over the years , Portnoy has also created tribute bands to The Beatles , Led Zeppelin , Rush , and The Who , which has allowed him to perform the music of his four favorite drummers .. Avenged Sevenfold. Avenged Sevenfold. Stone Sour. Stone Sour. Fates Warning. Fates Warning. Overkill. Overkill ( band ). G3 ( tour ). Nightmare. Nightmare ( Avenged Sevenfold album ). The Rev. The Rev. In September 2010 , Portnoy announced his departure from Dream Theater after 25 years .. Dream Theater. Dream Theater. He was replaced by Mike Mangini .. Mike Mangini. Mike Mangini. Since leaving Dream Theater , Portnoy has formed several new bands .. Dream Theater. Dream Theater. The first , Adrenaline Mob , a traditional heavy metal / hard rock band with singer Russell Allen -LRB- of Symphony X -RRB- and guitarist Mike Orlando .. heavy metal. heavy metal music. Adrenaline Mob. Adrenaline Mob. rock. progressive rock. traditional heavy metal. traditional heavy metal. hard rock. hard rock. Russell Allen. Russell Allen. Symphony X. Symphony X. Mike Orlando. Mike Orlando. On June 4 , 2013 , however , Portnoy announced his departure from Adrenaline Mob , citing scheduling conflicts .. Adrenaline Mob. Adrenaline Mob. He is also a founding member of Flying Colors , a progressive pop band also featuring Steve Morse , Neal Morse , Dave LaRue , and Casey McPherson ; and The Winery Dogs , a power trio also featuring bassist Billy Sheehan -LRB- Mr. Big -RRB- and guitarist Richie Kotzen -LRB- formerly of Mr. Big and Poison -RRB- .. Flying Colors. Flying Colors ( band ). The Winery Dogs. The Winery Dogs. Neal Morse. Neal Morse. progressive pop. progressive pop. Steve Morse. Steve Morse. Dave LaRue. Dave LaRue. Casey McPherson. Casey McPherson. power trio. power trio. Billy Sheehan. Billy Sheehan. Mr. Big. Mr. Big ( band ). Richie Kotzen. Richie Kotzen. Poison. Poison ( American band )
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