I looked out my door on May 1st to see pairs of two different types of grosbeaks in my feeder: evening and rose-breasted. In addition to:

black-capped chickadee
tufted titmouse
cardinal
gold finch
bluejay
house sparrow
hairy woodpecker
downy woodpecker
white-breasted nut hatch
mourning dove
crow
starling
grackle
red-bellied woodpecker
american robin
red-winged blackbirds (in a flock--probably passing through)