Spanish and Portuguese sound very different, although in written form they are rather similar. Also, the Portuguese as spoken in Brazil and Portugal are very different. I have a detailed page about Portuguese pronunciation, focusing on Portugal, but there are some explanations about the Portuguese of Brazil as well. There are lots of sound samples (mostly taken from fado music) to illustrate my point. The site starts here: http://rudhar.com/foneport/en/foneport.htm of sorted by written letters: http://rudhar.com/foneport/en/alfaport.htm .