Waxahatchee — which is either a band or singer-songwriter Katie Crutchfield, depending on how you define these things — released an outstanding record last year called Cerulean Salt, with guitar chords and vocals that keep on reminding me of Liz Phair. The good, early Liz Phair records, that is. Waxahatchee played Saturday night (April 26) at the Empty Bottle, beginning and ending the show with quiet songs that were essentially solo Katie Crutchfield performances. In between, the full band kicked in, showing that Waxahatchee is more than mellow folk rock. Most impressive of all was the way Crutchfield’s melodies, stuck in my head from many listens to the records, rang out in concert.