I understand that you have heard it that way and you can say "It don't taste like the time I had it last year" but you would sound like a hip hop or rap singer or someone uneducated: so I would say: It doesn't / or didn't taste like the time I had it last year

I would be careful with trying to learn grammar from popular music as many times it is wrong. As gregg said above a lot of times in rap and hip-hop (but here I think it the Killers if I'm correct) the grammar is simplified and will often sound like that. Speaking the way above is actually associated with a type of dialect in english though. Ebonics is actually a dialectic formed from the Black American slaves in America's history, and is still spoken a lot in predominately black communities. It generally is regarded by people as sounding uneducated though. As gregg said it would be said, "It doesn't/didn't (depending on tense) taste like last time." I just thought you might want to know about the dialect so I thought I'd share.

You are right, it is not the correct way to say it, but song lyrics tend to bend the rules to fit with the music. It may also be an attempt to sound more informal, a way some people actually speak (a way that makes me cringe, but in the end, it is a living language and I am sure we would sound lax to someone from only a few centuries ago!)

You might hear "It don't" occasionally, especially in song lyrics, but it is generally considered bad English. I recommend not saying it.

Thank you, I know what you mean and you're right. I don't try to speak with a dialect but I've heard this kind of expression a lot of times and I thought it was incorrect but I was trying to know if it is allowed to say it like that, I'm not going to do it though.