Download the logo by right-clicking (secondary-clicking) the image above and selecting "Save As..." or similar option.
If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
"A cappella" is a term used to refer to a style of singing without instrumental accompaniment. It comes from Italian literally meaning "to chapel", but used as "in the manner of the chapel". This phrase is two words, and "cappella" has two P's and two L's. A common misspelling is "acapella".
A compact version of the logo is available here.
Yours truly has made a song about this usage.
Logo and details are available under the Standard Free License. Please credit this page or any of the accounts listed on my homepage.