Lyle Mays, an acclaimed pianist, keyboardist, and composer best known for his long and close association with guitarist Pat Metheny, died Feb. 10 in Los Angeles, after what his niece, vocalist Aubrey Johnson, described as “a long battle with a recurring illness.” He was 66. Mays was a cofounder of the Pat Metheny Group in 1977 and remained a member for 33 years, serving as co-composer and primary arranger; the group enjoyed considerable crossover success and won 11 Grammy awards. However, he also had his own solo career, thereby earning another four Grammy nominations, and worked with a host of other musicians, including Pat Coil, Bobby McFerrin, Rickie Lee Jones, Earth, Wind & Fire, and Joni Mitchell. After leaving the Pat Metheny Group in 2010, Mays essentially retired from the…