As an elementary music teacher I am well aware of the Silver, Burdett, and Ginn series. In all honesty, it is what helped to get me through in my first year. Looking through the various textbook editions, it's interesting the progression of songs and curriculum maps based on newfound knowledge on the development of children's voices.
Comparing all textbooks curricular plans, I personally think the 1995 edition of The Music Connection is the best. In the 1920 text, the curricular plans were based off of the tonic chord and diverged from there. In the 1903 version, the songs are arranged by key. To me, this is just ridiculous. Then the 1995 edition started to sort out songs based off of units of study or lesson objectives (Ex. melody, form, harmony). Unfortunately, in the 2000 text, I didn't understand how the music was arranged. I think the first unit is supposed to get the student accustomed to singing again and singing with other children and the second unit is focused on rhythm.
I was very surprised to see how wide the ranges were in the early texts. In the song "Little Miss Tulip" the range was over an octave. I can't believe that this was intended for 2nd/3rd. My students really struggle with singing above a D5, so I try to choose songs that don't go any higher. I also noticed that this song had a lot of skips (and some of them were big skips). Usually songs that I choose are skipping within the chord (do-mi-so). I suppose there wasn't really an attempt to connect this song with another aspect of the curriculum, other than singing a song for spring.
In "A Lesson for Giving" I was surprised to see the song written in 3-part. Thinking back to when I was teaching middle school choir, we were only just beginning to introduce 3-part in the 8th grade choir. 7th grade was still singing 2-part. Looking at the music, I wonder what part the boys would sing because this is usually when the changing voice begins. For middle school. I didn't find the range for the soprano or alto I part to be too challenging. However, I felt the alto II part was way too low. I also thought that there were too many non-chord-tones.
"Don Gato" is still a 3rd grade favorite! I honestly don't know who likes the song more, the students or myself. Comparing this song to "Little Miss Tulip" you can see that the range has changed dramatically. The song is less than an octave and I believe the tessitura lies mainly between D - A. The song could easily be connected to units on world music, specifically Mexico, and perhaps a verse could be sung in Spanish.
"Free at Last" has appeared in several texts that I've seen. I noticed that of all the songs, this one has the smallest range (when looking at the group singing part only). The song would be a great connection to how slaves used to teach each other songs (call and response) and the connection to American history. The solo singer has one line where they have to sing up to a D5, but it isn't anything that is unattainable. I think, the reason for the small range and tessitura, is meant for the male changing voices.
I think that the books have come a long way since 1903. Most of the books have improved with a better organization of songs and songs that are vocally appropriate for children. It's interesting to also see that the newer textbooks include chord symbols in the vocal score. Perhaps this is for people like me, who would rather play melody in the right hand and chords in the left.