I had that very thing happen some time back.

I used BB/RB to create a song with tracks and the melody line riff that the RB track created was cool so I kept it in the song...... then, while listening to some songs posted in the User Showcase, I heard that very same lick that was in my song in another person's song. We're all using the same exact software and sampled loops..... chances are it will happen.

I have also noticed that when using the same style and also the same players in RB, yup... you can get repeats from earlier projects. More than one time I have had to change course for that very reason.

Now.... having said that... all that is below the level of copyright infringement since none of those songs are making money. Unless you copy a big time artist with an ego like ...oh...say..... Prince..... you probably don't have to worry too much.

OK next scenario. Two writers using BB/RB write a song and the licks are similar.... the odds of that happening are slim to none, so I wouldn't lose any sleep over it. The biggest factor here is the chances that both of them would have a song which they recorded in BB/RB get recorded by a national artist, and get airplay and chart position, and make money AND the artist keep those licks in the song's tracks...... even more unlikely.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.