For information see notes in the brands of the numerous psalms
Authorship and Titles (or Superscriptions)
On the 150 psalms, best 34 lack superscriptions of any kind (just 17 inside Septuagint, the pre-Christian Greek translation associated with OT). These so-called “orphan” psalms are observed mostly in products III-V, in which they have a tendency to happen in groups: Ps 91; 93-97; 99; 104-107; 111-119; 135-137; 146-150. (In publications I-II, just Ps 1-2; 10; 33; 43; 71 shortage titles, and Ps 10 and 43 are actually continuations of this preceding psalms.)