Coming out of Canada in the late 1970s, melodic hard rockers Triumph went on to temporarily rule the world throughout the ’80s, but after disputes over creative direction and business affairs, imploded by the end of the decade.

Although the core line-up comprised of guitarist/vocalist Rik Emmett, bassist/keyboardist player Mike Levine and drummer/co-singer Gil Moore occasionally reunited for special occasions back home, it appeared extremely unlikely anything else would develop until the group’s “Rock & Roll Machine” documentary, “Magic Power: All-Star Tribute” album and 50th anniversary sparked renewed interest.

In fact, when Triumph announced “The Rock & Roll Machine Reloaded” Tour, a Rosemont Theatre date sold out so fast, a second was quickly added, though again, demand was so substantial it resulted in an upgrade to the Allstate Arena.

It’s a building these Canadian Music and Songwriters Hall of Famers know well as the former Rosemont Horizon, where they last played a whopping four decades ago, and even if this edition looked a little different beyond the original power trio, it sounded exactly as it should.

That’s because the nucleus was still comprised of virtuosos Emmett and Moore, alongside the equally reliable likes of Todd Kerns (Slash, The Age Of Electric) filling in for the ailing Levine, plus additional guitarist Phil X (Bon Jovi, Triumph’s post-Emmett project “Edge Of Excess”) and drummer/keyboard player Brent Fitz (Slash, The Guess Who).

Without new tunes together, the guys more than made up for lost time by diving into its explosive annals, setting off literal and virtual fireworks during “When The Lights Go Down,” “Somebody’s Out There” and “Spellbound,” while swapping lead vocals and sporting the modern day equivalent to the light show on the “Stages” cover.

Other tracks from its primary period included “Hold On,” “Allied Forces,” “Rock & Roll Machine,” “Never Surrender” and “Lay It On The Line,” which in spite of such prolonged absences, never lost a hint of their luster and came across as optimistic, arena-shaking anthems.

Nearly two hours later, the same could especially be said about “Magic Power,” “I Live For The Weekend” and “Fight The Good Fight” as the multi-generational masses screamed along and Triumph certainly lived up to its namesake.

Early arrivers also got to taste another one of America’s prominent northern neighbors, April Wine, who are currently led by longtime guitarist Brian Greenway following the passing of co-founding front man Myles Goodwyn.

He and the rest of the otherwise expertly rebooted band brought over a half century of like-minded heaviness, including “I Like To Rock,” “Just Between You And Me,” “Sign Of The Gypsy Queen” and “Roller” to sturdily supplement Triumph’s completely unexpected yet invigorating reunion.

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For additional information on Triumph and April Wine, visit TriumphMusic.com and AprilWine.Ca.

For a list of upcoming Live Nation concerts, visit LiveNation.com.

Upcoming shows at the Allstate Arena include Bring Me The Horizon (May 15); Palomazo Norteño (May 22); Cody Johnson (May 30); Romeo Santos and Prince Royce (May 31); Forrest Frank (Jun. 4); Nate Bargatze (Jun. 13); Carín León (Jun. 18); Josh Groban and Jennifer Hudson (Jun. 27); Louis Tomlinson (Jul. 3); El Coyote and Chuy Lizarraga (Jul. 11); Melanie Martinez (Jul. 17); Benson Boone (Jul. 24-25); Chicago and Styx (Aug. 1); Mon Laferte (Aug. 15); Los Ángeles Azules (Aug. 22); Grupo Frontera (Aug. 26); Chayanne (Aug. 29); Banda MS (Oct. 3); Disney’s “Descendants,” “ZOMBIES” “Camp Rock” (Oct. 21); Maná (Oct. 30) and Zac Brown Band (Nov. 21). For additional details, visit Rosemont.com/Allstate/.