There are many songs that came recently, you just have to keep being updated thats all.
You can start with Kagerou Project songs if you want, they are very popular and there are many songs which uploaded only in 2013.
You can subscribe to some Vocaloid songs uploaders to keep on track with all of the new songs and stuff, and even old songs is good to cover. Iroha Uta is my favorite Vocaloid song and its from 2009, nobody really cares if the song is old or not.
Sorry if my English wasnt really clear or something, I dont keep my grammar well if I type fast or something ^^"