I have been on an orgy of reading Sharon Shinn's Samaria series. Samarians have lived on this planet for hundreds of years, being brought hither by their god, Jovah, in his hands. They have a tradition of angels, humans with wings, interceding with Jovah through song in times of need: plague, drought, flood, famine. Oracles are the only direct contact with Jovah who direct the principal angel, known as the Archangel, to his/her ordained mate. Every twenty years a new Archangel is chosen by Jovah. Shinn has created a land rich in variety of terrain, climate and peoples. Angels' lives are filled with vocal music.
http://www.fantasticfiction.co.uk/s/sharon-shinn/Connie Willis' new book,
Blackout, takes us once again to the Oxford History Department in 2060 and the time-traveling historians. The nitty-gritty of time travel is exhausting; there are costume fittings, language and accent implants, skills to learn, for example, if you are to be a reporter observing the arrival of the troops from Dunkirk, you need to know how to put paper into your typewriter, how to us the telephone system of that time, etc. etc. Imagine the pressure on the lab where the actual transfers and retrievals take place. Strict adherence to schedules in vital. Then, when the head adminisstrator starts to arbitrarily alter those schedules, chaos ensues.