Myxer problems?!?!?!?

My friends always get the exact ring tones they want, but when i try they always give me totally different songs, i try just typing in, for example, favorite girl by justin bieber. ill type in favorite girl and it doesn't work, then ill type in favorite girl (made by the famous justin bieber) or something like that. but, i want to know how to get the right song for myxer. please help(: