Yep, got two Lamb of God songs on my iPhone. Not too much of a fan of the vocals (I normally prefer metalcore these days, not too much heavy stuff), but the instruments make the band.
Love Written by Wolves and The Wise Man's Fear when it comes to newer metalcore artists. Memphis May Fire, Mutiny Within, Abandon All Ships, All That Remains, Asking Alexandria, Beartooth, Behind the Tales, Black Tide, Black Veil Brides, blessthefall, Bring Me The Horizon, Bury Tomorrow, Asfirefalls, August Burns Red, Caliban, Crown The Empire, Darkest Hour, The Dillinger Escape Plan, The Black Dahlia Murder, Disturbed (especially Disturbed), Escape the Fate, Feed Her To The Sharks, Falling in Reverse, ICE NINE KILLS, Huntress (even though the main singer passed), Monster Eats Manhattan (an awesome local St. Louis metalcore band), Pierce the Veil, POYNTE, Protest the Hero, Ravenface, Senses Fail, Sleeping With Sirens, Sonic Syndicate, State of Mine (mostly metal covers of country/R&B songs, but Dragging Me Down is sooo good), System Of A Down, Upon This Dawning, We Came As Romans, The Word Alive...those are bands that have multiple songs on my iPhone when it comes to metal and metalcore.