Remy - I really really love the vibe. The bd and snare are clipping slightly. I just hear Guru on this one. It'd be his style.
Back street - When I make the counts it all comes all right, but I just gives an impression of being very irregular, which could have been an interesting idea, but it's sorta excessive. Of course, like stray said, the strings are very off key. Change the sample's pitch, or take it off.
Believe Me - It's ok, you could rap on it, but it'd be more like a Justin Timberlake song.
Make It Happen - My favourite of the whole package. It's a very very good beat. I'd let the two differents vibes stray spoke of last longer, or find a better way to link them together. But I guess it's more about personal taste. As is, I still really enjoy it. Good job on this one.
Reynold's Rap - I don't like the guitar at the beginning. Just too metallic. Replace it by something more mellow like nylon guitar. A part just sounds like Radiohead or Portishead stuff. it's good, but I don't think it'd make a crazy rap track.