Rose-breasted Grosbeaks males (Pheucticus ludovicianus) are quite distinctive in appearance. They are black on the upper body and wings, white below with white wing bars, but most distinctive is the rose triangle on their upper breast. The females are brown with a speckled underbelly.
Grosbeaks are members of the cardinal family. Both Grosbeaks migrate to central America in winter, although Northern Rose-Breasted species may migrate to Southern states. They all head North in spring to raise their families, unlike the Northern Cardinal which are permanent residents. Grosbeaks are found in open woods, scrubby fields, and thickets where they forage for insects, seeds and berries.
The Rose-breasted Grosbeak's song is described in allaboutbirds.org as "like that of the robin, only as sung by an opera singer, being mellower and more sweetly melodic." You can hear the song there and compare it with the Blue Grosbeak here.