db = shell.props.db

query = db.query_new()
db.query_append(query, [rhythmdb.QUERY_PROP_EQUALS, rhythmdb.PROP_TYPE, db.entry_type_get_by_name('song')])
qm = db.query_model_new(query)
db.do_full_query_async_parsed(qm, qm.props.query)

pm = db.property_model_new(rhythmdb.PROP_ALBUM)
pm.props.query_model = qm

albums = []
def collate (model, path, iter):
	albums.append(model.get(iter, 0))
pm.foreach(collate)