...where the furigana is a different "word"/"synonym" for the actual kanji in song lyrics, titles, etc.?

A couple references to this:

* [Why are some lyrics' words written in kanji whose usual reading is not how it is sung?](https://japanese.stackexchange.com/q/198/78)
* [サモンナイト ツインエイジ 〜精霊たちの[共鳴]{«こえ»}〜](http://www.summonnight.net/snworld/snta/index.html)

Is there any distinct name for this technique?