Agree totally with Rushton on the RCA Classic 45's; i have them all and play them frequently. i also have some of the RCA originals and the 45's are a whole new level of musical energy and information.
A few of them are slightly 'hot' on top for my vdH Colibri (which itself is a bit tipped up) and i turn down my tweeter gain.
a few others besides those 4 Rush mentions that i really enjoy are the Mussorsky, 'Pictures'; the Rimsky-Korsakov, 'Shaherazade', and the Heifetz 'Brahms Violin Concerto'.
If you ever wanted to demonstrate what high end audio can be to someone who has never heard a high end system; these 45's played on a quality tt will do it. or show a digital fan how a tt can sound. the 45's are pretty much....game, set and match (except for master tapes from The Tape Project).
for Classical lovers my favorite 45rpm demo disc is the first disc for 'The Royal Ballet'. breathtaking!
for rock fans i ask what is their favorite Led Zepplin cut? the 45rpm box set has them all. we might play the cd, then the excellent Classic 33 rpm version, and then the 45. the 45 makes the 33 sound dead and flat in comparison. the 45 LZ set energizes every molecule in the room. they are a force of nature. way more information.
yeah, the 45's basically rule.
don't get me wrong; i love 33's and the best DTD 33's can be on the same level as 45's to some degree. 33's have nothing to apologize for.
the better your vinyl system is; the more headroom a 45 has to operate in. lower noise floor, more ability to communicate space and dynamic contrasts, deeper bass, more top end air. i can understand why some people are not as 'taken' by 45's as others. but that is true of any type of software; as any system matures more information is revealed. the big thing about 45's is just how much information is there to be found.