Karaoke can be a great time, as everyday people can get up onstage and simply grab a microphone and unleash their inner rockstar. But let's be honest, not everyone's inner rockstar is as tried and true as the professionals who play music for a living. Yes, there are some great singers out there who can get up in front of a group and belt with the best of them, but these are not those singers.

We've scoured the Internet and found several performers out there offering their own unique takes on some of rock and metal's most beloved classics. And before you decide to step up to the microphone, we've offered a few tips to make sure your performance doesn't go awry like those seen in these videos. So, without further adieu, check out these 7 Karaoke Fails of Rock and Metal Classics.

  • 'Enter Sandman'

    Originally by Metallica

    Doctor K. Chaudhry has built up quite a YouTube following for his renditions of songs across all genres of music and his particular affinity for Metallica. However, one of the things that most of Dr. KC's videos have in common is his reliance on the words in front of him, causing the good doctor to constantly sing off time. Just watch as his performance of Metallica's 'Enter Sandman' misses the mark in several spots, leading to this karaoke fail. So be sure to know your song and come in on cue!

  • 'Smells Like Teen Spirit'

    Originally by Nirvana

    Karaoke goes better with beer … or does it? As we see in this video, a group of friends have had a few, double fisting with a microphone in one hand and a cold brew in the other. While alcohol may help you unleash your inner Kurt Cobain, there comes a tipping point where your ability to gauge your own awesomeness tanks. Watch as this group of friends bond while performing karaoke to Nirvana's classic 'Smells Like Teen Spirit' and remember -- louder and drunker isn't always better.

  • 'Chop Suey'

    Originally by System of a Down

    When performing karaoke, song choice is key, and only a brave soul dares to take on the System of a Down classic 'Chop Suey!' You truly gain an appreciation for Serj Tankian's rapid fire delivery, especially after watching someone like karaoke performers Bev and Bob offering their rendition of the track. While they do get bonus points for the psychedelic background, Bev and Bob and most karaoke performers would be wise to start at a simpler level.

  • 'Run to the Hills'

    Originally by Iron Maiden

    Know your range! We love Iron Maiden, you love Iron Maiden, but not all of us can pull off Iron Maiden. Bruce Dickinson has hit some of the most powerful high notes in the history of metal and if you don't know your range, you could run into a situation like this one provided by YouTube user Rypro525. Yes, he's got the forcefulness of the track in spades, but the monotone delivery and inability to reach anywhere near Dickinson's range makes this one an ear-splitter.

  • 'Girls Girls Girls'

    Originally by Motley Crue

    Motley Crue's Vince Neil has a very distinctive voice -- one that's not easy to replicate -- and when it comes to karaoke, sometimes it's best just to put your own stamp on it. Take, for instance, Derrick Massey, his friend Meat, and a cameraman named Berry who also chimes in. Their good time rendition of 'Girls, Girls, Girls' takes a turn south when one of the performers breaks out a truly cringe-inducing falsetto. Avoiding the falsetto can help you evade a karaoke fail.

  • 'Iron Man'

    Originally by Black Sabbath

    Okay. Put your stamp on it, but don't overdo it. In this cover version of Black Sabbath's 'Iron Man,' our star Tony Lee decides to add his own percussion to the track, but the off-screen beating of the microphone nowhere near syncs up with Bill Ward's original beats. Add in the use of some echo on Tony Lee's vocals, which at times works but other times not so much, and you've got the makings of a bad cover.

  • 'Crazy Train'

    Originally by Ozzy Osbourne

    Passion is great when it comes to karaoke, but make room for melody and rhythm. As 'Coz the Shroom' shows in his performance of Ozzy Osbourne's 'Crazy Train,' he's more than got the moves and energy down, but is somewhat lacking when it comes to keeping the melody and rhythm of a song. And once again, shouting is not always singing. It may be metal, but there's still some dynamics to it.

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