Don't worry, the mashup is coming ;). It will be uploaded at the start of next week.
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Orchestral Cover: Written and Orchestrated by JJ Molyneux
  / joshuamolyneux  

Original Piece and Melodies: Written by Toby Fox

Art Source: https://wallpapercave.com/w/wp10613243

Software used;
-FL Studio
-East West Composer Cloud
-reFX Nexus