There are many genres that fit well with good tempos, like Reggae, Pop, Rock, Alternative, Electronic, Dance and R&B. There are also songs that would be good for running, such as Beat It, One More Time, and Temperature.
iTunes
No, you cannot.
itunes classifies them as rock.
On a Mac click on the music file in a folder and drag it into the iTunes Window and the music will be added to your iTunes library. If iTunes is not running you can drag the music file into the iTunes icon in the dock and it will be added to the library.
On Itunes, Trey Songz music is categorized under R&B/Soul.
The genre of music Justin Bieber sings is pop.
Reinstall iTunes
Whatever kind of music genre you like the best. If you like calm alternative songs, you should check out Coldplay. If you like very heavy metal, you should check out Disturbed. Once you buy a few songs through iTunes, you can use the Genius Mixes that iTunes has available in the iTunes store, which tells you what music you might like based on the music you have in your iTunes library.
classic folk, pop mixed with alternative - based on iTunes-
Yes, once you have iTunes running you can add existing mp3's to your library. You can also rip your CD's to the iTunes library. These can then be sync'ed to your ipod
itunes music gigabytes
My Itunes says Electronica :)