do this. On-board electronics let guitarists move about the stage rather than stay in front of a microphone. On-board electronic tuning, availability, uniformity, and frugal costs facilitated performances by guitar ensembles like Robert Fripp's Guitar Craft students. Ovation has also produced solid-body electric guitars and active basses. Ovations reached the height of their popularity in the 1980s, where they were often seen during live performances by touring artists, such as Rush's Alex Lifeson or Paul Simon in The Concert in Central Park. Ovation guitars' synthetic bowl-shaped back and early use (1971) of pre-amplifiers, onboard equalization and piezo pickups were particularly attractive to live acoustic musicians who constantly battled feedback problems from the high volumes needed in live venues. Ergonomics When he became one of Ovation Guitars' first endorsers, Glen Campbell suggested reducing the weight of the guitar, which he had discovered caused back strain. After that, Ovation reduced the weight of several models and pioneered "super-shallow" guitar bodies. While it was produced, Ovation's super-shallow 1867 Legend was the recommended guitar in Robert Fripp's Guitar Craft. wrote that the acoustic 1867 Legend has "a gently rounded super-shallow body design that may be about as close to the shape and depth of an electric guitar as is possible without an intolerable loss of tone quality. Fripp liked the way the Ovation 1867 fitted against his body, which made it possible for him to assume the right-arm picking position he had developed using electric guitars over the years; on deeper-bodied guitars, the Frippian arm position is impossible without uncomfortable contortions." Model overview The Ovation Guitar Company produces guitars under the names Ovation and Adamas. Ovation guitars have been also produced in China, South Korea and Indonesia. Import models generally have a wooden top. Recently, Ovation significantly reduced U.S production. From 2010 on, better models—Legend, Elite, Custom Legend, Custom Elite—were made both in the U.S. and in Korea. Before that, these models were U.S. made. In recent years, many U.S. made are identifiable by "LX" in the product name (e.g., Legend 2077LX), whereas Korean versions have "AX" in the model name (e.g., Legend 2077AX). Ovation does not use this convention on all models (e.g., Ovation 1617ALE). Currently, Ovation produces only a few U.S. made models, mostly signature and limited edition models (e.g., Custom Legend 1769-ADII Al DiMeola). Production of the standard model range of Ovation guitars in the U.S. had been ceased under the