Every composition in the Early Music series of Scholarly Brass Editions contains the source facsimile, an Urtext edition with errata, and a minimally interpretive performance edition.  Such should satisfy the widest possible range of needs.  The performance editions are of particular value for being notated at A4 = 440Hz.  These works were composed during a period when A4 ≈ 466Hz on cornettos, trombones, and organs (i.e. a Baroque A = a current B-flat).  Performing the original notation on an instrument conceived of as being at A440 would result in all sounding pitches being a semitone too low. 

With this series, players can perform the composer’s original intent without having to learn new fingerings or slide positions.  To clarify, playing a performance edition part on a B-flat tenor trombone (A440) and playing the same Urtext edition part on an A tenor ‘sackbut’ (A466) will produce the same sounding frequencies.  To further facilitate performance, when and where appropriate, supplemental parts are included in transposition and/or alternate clefs (e.g. E-flat alto trombone played using B-flat tenor trombone slide positions via notation a perfect fourth lower than sounding pitch and in tenor clef).