So, PaRappa the Rapper is a rhythm game for Sony's Playstation. It functions like a game of Simon where the teacher of the song will rap one verse then you will have to rap that same verse by copying the pattern of which buttons to press. The game is very fun but sometimes doesn't register the button that you pressed. The story is that there is a young boy named PaRappa and he wants to be the worlds best rapper and also win the heart of the girl of his dreams, a flower named SunnyFunny. 
The first song/rap is a tutorial showing the basics of how the other levels will play out. PaRappa realizes that he wants to become a hero and he then goes to see Chop Chop Master Onion, a rapping humanoid onion who teaches karate. The level is generally easy and it is mostly one note verses and then two button verses and then he does throw in some three button verses. It has a pretty catchy tune and its fairly simple, Most people will remember the phrase "Kick! Punch! It's all in the mind." which is the first phrase of the first verse. The song also includes samples from 'The Assembly Line' by Commodores.
PaRappa then realizes that he needs a car to basically get anywhere and he decides to get a drivers licence so he can take SunnyFunny and KT and PJ Berri anywhere he wants. This stage is my favorite, it isn't too easy and it does challenge you but not too much. In this song you will be rapping with Instructor Mooselini who is a female moose who is also a driving instructor. The song is really catchy and the lyrics will be stuck in your head for weeks, also the song is based off of a song called 'Turtles Have Short Legs' by Can. The most memorable part from this stage is probably "Do you know why we stopped the car? (Do I know why we stopped the car?) Guess! (Guess!) What? (What?) I forgot to close the door. (You forgot to close the door.)"
PaRappa borrows his dad's car and he gets involved in a car crash causing the car to break, PaRappa then needs money so that he can replace the broken car so he decides to work in a flea market with Prince Fleaswallow. The rhythm is slow and funky and it is very hard because it has loads of button spamming but it's a good song overall. Pogo has sampled this song a few in two of his songs like 'Rise & Glide'. 
SunnyFunny's birthday is tomorrow so PaRappa decides to buy her a nice cake but then he slips and he ruins the cake. He then goes home and bakes a cake while watching a cooking show on TV. The tune is funky and it is a very hard level because for some reason on this level the buttons register later than I press them. But anyway, Cheap Cheap is the name of the Chicken that runs the show and the song is sampled in the song 'Wah Wah Man' by Young-Holt Unlimited.
On Stage 5 PaRappa needs the toilet so he goes to the gas station but there is a line of each of the last characters from stages 1, 2, 3 and 4. You must rap to get access to the toilet. It's pretty funny but it's not the best level. 
And finally level 6 is PaRappa on stage preforming basically.

This posts looks more appropriate for game discussion than game review. There is some mention of the "story" behind the game but there is barely any mention of the game mechanics, what it looks like visually or the difficulty level at large