Does "singing like a hummingbird" have the particular meaning?
As you probably know, there was a line in the song of Eurovision Song Concert's winner Mans Zelmerlow. It went like this: "Now go sing it like a hummingbird / The greatest anthem ever heard".
So I became curious if it means something in partucular, if it has some legends behind.
Because recenly I've found that mockingbird is used sometimes for its legend that it's the most harmless bird and killing it is the biggest sin. So, is here something?

Question

Does "singing like a hummingbird" have the particular meaning?
As you probably know,  there was a line in the song of Eurovision Song Concert's winner Mans Zelmerlow. It went like this: "Now go sing it like a hummingbird / The greatest anthem ever heard".
So I became curious if it means something in partucular, if it has some legends behind. 
Because recenly I've found that mockingbird is used sometimes for its legend that it's the most harmless bird and killing it is the biggest sin. So, is here something?

Answer

It is just a line in a song you can view it any way you want

Answer

It doesn't mean anything in particular. It's just a line in a song, chosen for the sound, the rhyme and the rhythm.

Answer

It means nothing.  Humming birds aren't known for singing. I'd guess it's a poor lyric.