I'll be straight with you. This entire post is just a pretext for sharing a video of what may be now my second all-time favourite mash-up.
I could have just played the video, but I didn't want you thinking I wasn't making an effort. So you'll have to sit through four songs with the word "mash" in the title first.
Before you ask: no, it's not that Cary Grant; and yes, it is a shame that Earl Sixteen is being a bit of a party pooper with his anti mash-up views but just ignore him (and those contrarians from Melbeat who want you to mash down not up).
"Mish Mash" - Carrie Grant
"Satchmo's Mash Potato" - Girl Satchmo & The Mashers
"Mash Down" - Melbeat
"No Mash Up the Dance" - Earl Sixteen
If you've survived all of that and are still here, here's my second all-time favourite mash-up.