No. I like to keep everything on one device.

I have a smart phone, but don't listen to music on it. I use my portable CD player to listen to music.

I just use my phone, beforehand I used my PSP. I don't have space to carry around another device.

crap,.. i voted wrong.

my smartphone is my dedicated device for (in priority order):
music player
GPS
camera
mobile email
mobile internet
video camera
phone
mobile games in commuter situations

games is the only place where i actually own alternative device to what my smartphone can do. even then i only carry it on longer trips.

Nope. I use my phone to play music too. I just make sure it's charged fully before I leave the house.

I used to use my PSP for music and my phone for other things. Then, I began using my 3DS. Nowadays, I only use my phone.

I recently found my old MP4, and I've been listening to the songs in it every once in a while.

I mostly use my phone, since I don't carry the MP4 around, it has more and newer music I've bought, has YouTube compatibility, and I can use it to browse the web.

No. 'm using spotify.

Sometimes i'd bring them. But most of the time smartphone is enough. It's bulky in my pocket