Sometimes with mashups people get it very very wrong but occasionally I stumble across some amazing mashups. Isosine are a YouTube channel that have created some very interesting mixes. Most recently mixing Miley Cyrus and Mumford & Sons.
Personally I love Claritycraft. A mix of three songs; It’s a great mix of genres but the beat is a constant and amps up from the originals.
The other mix I think is absolutely genius and somehow perfect is Little Wrecking Ball. It might be better than the original Wrecking Ball. Thoughts?