I dont have I'm A Boy either, was looking for it, But I dont think it is a soundboard. Here is the Info i got off line:
5-6 April 1968: Fillmore East, New York
Approximate Length: 36m (audience recording); 57m (soundboard recording)
Sound Quality: The audience recording is fair and not very clear, while the excellent soundboard recording (from the Live at the Fillmore East bootleg) was recorded by the band for a live album—it has several cuts, for whatever reason.
Audience recording: Substitute, Pictures of Lily, Relax, I'm a Boy, C'mon Everybody, A Quick One While He's Away, My Way.
Soundboard recording: Summertime Blues, Fortune Teller, Tattoo, Little Billy, Can't Explain, Happy Jack, Relax (cuts), A Quick One While He's Away (cuts in), My Way, Shakin' All Over, Boris the Spider, My Generation (cuts).
Details: These recordings are kind of a mystery, mostly because the same version of Relax' is found on each. Nevertheless, the audience recording is thought to be from April 5th, while the soundboard recording is almost definitely a mixture of the two shows—two different versions of 'A Quick One' and 'My Way' seem to substantiate this. The audience recording includes the complete version of 'Relax', which Townshend stretches to unreal limits with endless rhythm and lead guitar bits; yet another Eddie Cochran number, 'C'mon Everybody', is announced as their usual backstage warmup song, and then played onstage for one of the few times. The soundboard recording comes from the band's own archives and is a very good stereo document (great separation) originally intended for a live album. A nice version of the newly-added 'Fortune Teller' segues directly into 'Tattoo', and a rare live version of the recently-recorded 'Little Billy' is preceded by an explanation of the song's origin by Townshend. Very long readings of 'A Quick One While He's Away' (incomplete, but the 'You Are Forgiven' section is endless), 'Shakin' All Over', and an incomplete 'My Generation' characterize this show, with the latter moving into a jam instead of a quick smash-up (which may still have happened). Recordings from this era show the band experimenting with long instrumentals quite a while before they developed them a little more—here they seem to go on forever instead of changing shape as in the Tommy era, when different themes would make the longer numbers much more interesting. It's also surprising that so few live recordings of 'Can't Explain' prior to this one exist.
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