How do you pass an apostrophe through a URL?

Had the same problem, encodeURIComponent didn’t encode single quote. The trick is to do the replacement of ‘ with %27, after the encoding:

var trackArtistTitle = encodeURIComponent("Johnny Vegas - Who's Ready Fo'r Ice Cre'am")
// result: Johnny%20Vegas%20-%20Who's%20Ready%20Fo'r%20Ice%20Cre'am
trackArtistTitle = trackArtistTitle.replace(/'/g, '%27')
// result: Johnny%20Vegas%20-%20Who%27s%20Ready%20Fo%27r%20Ice%20Cre%27am

This way, trackArtistTitle will be properly decoded on server i.e. with PHP using urldecode().