Fingers and Thumbs Books 1–3 by John York. Boosey and Hawkes, 1993, £3.50 each.Play Boogie Duets, Boogie Duets for Beginners by Daryl Runswick. Faber Music, 1993. £4.95 each.Let's all Play the Ollie Way! by Alison Hedger. Chester Music. 1992. £5.95; cassette, £4.95.Mikrokosmos Volume 1 by Bela Bartok. Boosey and Hawkes, 1987. Book and CDROM, £12.95.Abracadabra Piano Books 1–3 arranged by Jane Sebba. A. and C. Black, 1993. £3.99 each.The Piano Duet Collection edited by Alan Ridout. Kevin Mayhew, 1992. £6.95.Jazzy Duets by Mike Cornick. Universal Edition.Blue Piano by Mike Cornick Universal Edition, £3.95.