Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
A banger abstract-ish tune composed back in 2000 by Tempest aka Janne Suni, which then became famous when Timbaland plagiarized it in 2006. Initially ported it for my VLDC12 level, it's now much more optimized in size than before.
Fun fact, Timbaland actually plagiarised a C64 SID cover of Sunni's track, composed by Glenn Rune Gallefoss. He famously didn't give Sunni or Gallefoss any credit, and basically said "how dare they even ask" when grilled about it.