How to link an audio mp3 file created on soundcloud to your Youtube account
You may want to reupload the file to Youtube.

Convert the audio file (preferably your original, uncompressed file) to video with avconv -loop 1 -i cover.jpg -i original-track.wav -tune stillimage -r 1 -s 1280x720 -c:a flac -shortest -v error out-video.ogv (where cover.jpg is the still image you want to use for the video) or using a media converter like WinFF, and upload it to your youtube account.

You can place a link to the soundcloud page in your video description.