iPod Classic freezing my iTunes

Just recently been having this problem. Had this iPod Classic almost 2 years and been working good since the other day.

I was using iPod class stand alone to play a song and i tried to change to another song and it froze. iPod won't work at all.

So now i mounted it to my computer I use IMac, so all Apple stuff together, No windows here

I have Latest OS on my iMac as well, been working no problems for long time

but recently this happens. iPod classic freezes, it shows up on iTunes starts to Sync, a grind noise can be hear from my device

then ist jus says Connected and freezes

I have done a hard restart on iPod classic, it worked sort of, i got back to working iPod again but every song was erased, but able to function

now i can't still sync anthing

tried to use disk utility but still said its mounted so system won't do it

when i click off iTunes m i can't find device on Disk utility

i have read other similar questions and did the solutions, so far nothing yet

how can i get songs to lpod classic without using Itunes

FYI i have been able to use my iPod Touch in iTunes, worked perfectly

its just the classic i am having problems with

so solutions please and thanks