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Are all songbooks of solo voice music classed in 783.2 without breakdown by tradition of music, e.g., blues?
No. You can add notation for tradition of music, but first you must specify the form "songs." (Not all solo vocal music is in the form of songs; for example, Erwartung by Schoenberg is an opera for a single soprano plus orchestra.)
Begin with the footnote associated with 783.2: "Add as instructed under 783.2-783.9."
At the span 783.2-783.9, you find the instruction: "Add to each subdivision identified by notation
01-4 from table under 783.12-783.19, e.g., secular cantatas 48."
In the add table under 783.12-783.19, follow the add instruction
"2-4 Nondramatic vocal forms
Add the numbers following 782 in 782.2-782.4, e.g., secular cantatas 48"
(Why choose the instruction at "2-4 Nondramatic vocal forms" instead of the instruction at "11-17 General principles"? Following the instruction at 780 to "class a subject with aspects in two or more subdivisions of 780 in the number coming last," you prefer notation 4+ to notation 1+.)
In other words, to build 783.242, the number for songbooks for solo voices, start with
783.2 Solo voice;
then add 42, from 782.42 Songs.
Next, follow the add instruction in the footnote associated with 782.42 "Add as instructed under 782.1-782.4." At the span 782.1-782.4, follow the add instruction
"11-17 General principles
Add to 1 the numbers following 781 in 781.1-781.7, e.g., rock music 166, rehearsing rock music 166144"
Summary: To build the number for a work containing solo voice music for blues songs, start with:
783.2 Solo voice;
then add 42, from 782.42 Songs to build the Dewey number 783.242 for songbooks for solo voices.
Next add 1, facet indicator for General principles [from add table under 782.1-782.4],
and then add 643, from 781.643 Blues to build 783.2421643.