jfranzone

<a href="http://lyricwiki.org" title="Lyrics From LyricWiki" rel="nofollow ugc">LyricWiki</a> is a free site which is a source where 
anyone can go to get reliable lyrics for any song from any artist without being hammered by invasive ads.
This plugin provides a widget to place a search box right on the sidebar of your WordPress site so 
that your readers can utilize the LyricWiki site and find their favorite lyrics from your blog!
<h3>Configuration</h3>
<ol>
<li>
Title – As with most widgets you can provide a title to display above the LyricWiki Search
</li>
<li>
Button Text – You can configure the text of the search button if you like.
</li>
<li>
Hide Help – Check to hide the small link to help
</li>
</ol>

Lyric Wiki Search Widget

Adds a sidebar widget to search for song lyrics on the LyricWiki.org site.

zetxek

Simple plugin to hide the lyrics of the songs you publish (they will be between [lyrics] and [/lyrics]). You can also use it for spoilers or any text you want to make viwable with a click.
It is SEO friendly and gracefully degrades in environments without javascript because firstly all the text is shown, and only when the page is fully loaded the text enclosed by the [wplyrics] text will be hidden, adding a link to make it visible.

WP Lyrics

Simple plugin to hide the lyrics of the songs you publish (they will be between [lyrics] and [/lyrics]). You can also use it for spoilers or any text  …

Lyric Wiki Search Widget vs WP Lyrics