Powerhouse 5 + 4; 1975 [FLAC limited time only]

Needless to indicate there are many artists called Powerhouse, but this particular formation's info can be found here.  Description therein:

Collection of tracks originally composed by Al Newman and performed by Powerhouse in 1975. Peer International Library was part of the Standard Music Library organization and was responsible for 45 releases between 1969 and 1980...

Apart from this, I don't see a lot of credits for the composer Al Newman.  That's unfortunate because this particular library release has quite a few gems on it.  Overall the music is nice and funky uptempo rocking energetic instrumentals, similar in sound to the Rock Machine by Hawkshaw once posted.

Late Summer has such a great groove, and the arrangement is so perfectly done too:

Almost as groovy is Injury Time: