Following are a number of back-translations as well as a sample translation for translators of Exodus 15:21:

• Kupsabiny: “Miriam was leading the song like this,
  ‘We are singing to our God
  because he is highly lifted/exalted.
  He pushed horses into the sea
  and people who were moving on those horses.’” (Source: Kupsabiny Back Translation)
• Newari: “Mirian sang this song p;
  ‘Sing to the Lord
  for He has done a mighty word.
  The horse and its riders
  have drowned in the sea.” (Source: Newari Back Translation)
• Hiligaynon: “Miriam sang this song to them:
  ‘[You (plur.)] sing to the LORD because he has-been- very -victorious.
  He hurled/cast into the sea the horses and the ones who ride on them.’” (Source: Hiligaynon Back Translation)
• Bariai: “And then Miriam made a song to them as follows:
  ‘You (pl.) sing to the Chief,
  because he surpassed his enemies,
  and so his name/status rose up very high.
  The oses together with the os owners,
  he threw them down into the ocean.’” (Source: Bariai Back Translation)
• Opo: “And Miriam sang for them music like this:
  «you sing music for Yahweh,
  Because he conquered enemies his all.
  Horse with its driver,
  He threw them in water.»” (Source: Opo Back Translation)
• English: “and she sang this song to Yahweh:
  ‘Sing to Yahweh,
  because he has triumphed gloriously over his enemies.
  He has thrown the horses and their riders into the sea.’” (Source: Translation for Translators)