Ha! I was in the middle of adding a WHOLE bunch of examples to my previous post, which included Ricardo Queso.
But since it got new-paged, I'll re-paste it here.
I'm a sucker for a good cover song (and a bad one, too)
Oh, yeah, Scary Pockets is super fun. The founder of that band, and half of Pomplamoose, is the CEO of Patreon.
The big one in the "Youtube Covers in mixed-up genres" space is Postmodern Jukebox. They've been around for years and years, and have a huge catalog. Then, if you like a particular singer, search for them as a "featured" singer on lots and lots of other channels. You'll see a few familiar faces from the Scary Pockets channel.
Me first and the Gimme Gimmes are a super group of members of other pop-punk bands (NOFX, Lagwagon, etc), doing pop-punk covers of everything from John Denver and Dolly Parton to Devo and Elton John.
Also check out:
Brass against who do rock covers, with a brass band with a guitar player and a drummer...everything from Rage Against the Machine to Tool, to Nine Inch Nails, to Living Color. Probably my favorite:
A.V. Club Undercover (they aren't around anymore, but lots of people have re-uploaded their videos). It was The Onion's media outlet, inviting bands in to pick from a list of cover songs. GWAR did "Carry On Wayward Son", Ted Leo and the Pharmacists did "Everybody Wants to Rule the World", They Might Be Giants covered Cumbawumba's "Tubthumping"
Frog leap Studios - One man band does metal covers. I love their cover of Toto's "Africa".
Puddles Pity Party: a very tall, very sad clown, who does mostly down-tempo, stripped-down covers)
Johnny Cash's "American" album series (I believe there were 5) were mostly all covers. Everything from the most famous NIN cover, to Nick Cave, Depeche Mode, Soundgarden, Tom Petty, Hank Williams, The Eagles, etc.
- Soundgarden's "Rusty Cage"
- Nick Cave's "Mercy Seat":
Iron Horse has two "Bluegrass Tribute to Metallica" albums (Fade to Bluegrass 1 and 2) and they are both excellent just as bluegrass albums on their own, completely separate from being Metallica covers.
Cowboy Junkies put out an album called "Neath Your Covers" which I like a lot. Springsteen's "Thunder Road", "Helpless" from Neil Young
There's a compilation album called "Soul Tribute to the Beatles" which has probably one of my top 10 songs of all time: Wilson Pickett's cover of "Hey Jude". It's got The Supremes, Ike & Tina Turner, Marvin Gaye, The Four Tops, Fats Domino, Earth, Wind & Fire, Otis Reading...all covering songs from The Beatles.
Apocalyptica was a cello quartet put out an album of Metallica covers. They put out a 2nd album with Much better production that was some metallic covers, but also Faith No More and Sepultura, and added drums and some vocals (including Corey Taylor from Slipknot). 3rd album had more originals, and more vocals. I'm not sure what they've done after their 3rd album, though.
Richard Cheese and Lounge Against the Machine. A guy in a tiger-print velvet tuxedo jacket, belting out Vegas-style lounge covers of everything from GNR, to System of a Down to The White Stripes, to Outkast, to Madonna, to Alice in Chains, to Rush, to White Zombie and U2.