By Keola Beamer and Mark Nelson Hawaiian slack key guitar (Ki Ho'alu) is one of the world's great acoustic guitar traditions. This tradition includes virtuoso guitar pieces, but the majority of songs played slack key are classic Hawaiian melodies eitherplayed as instrumentals or as accompaniment to vocals with instrumental breaks between the verses. The term \slack key\" does not refer to a type of guitar, but rather to any guitar played in the slack key style, that is, in alternate tunings with \"slack ed\ strings and fingerstyle technique. Acknowledged slack key master Keola Beamer is a member of a family known for its musical artistry for generations. We are fortunate to have him writing in conjunction with veteran Mel Bay author, educator and multi- instrumentslist Mark Nelson, who simply followed his love of the music to the Islands. Written in standard notation and tablature to accommodate numerous alternate tunings, this book is presented in four sections: 1) The most common tuning introduced by fairly easy songs; 2) Illustrations of how to build your own arrangements; 3) A presentation of various slack key tunings; and 4) A selection of duets in the slack key style. Historical and cultural insights are offered throughout in the spirit of aloha,producing an informative, musically enlightening book with soul and humor. The companion CD features tuning tracks and informal introductions of the audio content by the authors, plus some beautiful slack key music. 160 pp. (Mel Bay Publications, Inc.)