The top-liner usually is also a singer, and will sing over the track as the demo singer. If the song is for a particular artist, the top-liner may sing the demo in that artist's style. Top-liners often work in groups to co-write. Sometimes producers send out tracks to more than one top-line writer so that the producer or singer could choose the best option. Since the track is the same, melodies by different writers can sometimes be very similar. Occasionally, the producer might choose a few lines of melodic or lyrical ideas from one top-liner without properly crediting or paying them. These situations sometimes result in legal battles over ownership of the melodies or lyrics.