Yellow Bird, Yellow Bird, what are you?

So we have this pretty yellow bird that we see every so often.  I looked in my trusted National Geographic Field Guide to the Birds of North America. 2006 edition. Newly purchased.

Obviously it is a yellow bird with black markings on head and wings. Orange beak, wondering if this means it's the girl, like with cardinals. I search my book, thinking maybe it's an Oriole? or a Warbler? 

No, not these, but ...

 It is an American Goldfinch and it's the boy! 

Found a website to give more information if you're interested.

http://www.allaboutbirds.org/guide/American_Goldfinch/id

or to listen to his song, here's a link.

http://www.enature.com/fieldguides/detail.asp?allSpecies=&searchText=goldfinch&cmdSubmit.x=0&cmdSubmit.y=0&GroupID=&curGroupID=1&lgfromWhere=&curPageNum=3