Now playing for Cmus and Apple Music on macOS

np.sh

#!/bin/sh
unset title

if info=$(cmus-remote -Q 2>/dev/null); then
  status=$(echo "$info" | grep -v "set " | grep -v "tag " | grep "status " | cut -d ' ' -f 2)
  if [ "$status" = "playing" ] || [ "$status" = "paused" ] || [ "$status" = "stopped" ]; then
    title=$(echo "$info" | grep -v 'set ' | grep " title " | cut -d ' ' -f 3-)
    artist=$(echo "$info" | grep -v 'set ' | grep " artist " | cut -d ' ' -f 3-)
  fi
else
  title=$(osascript -e 'if application "Music" is running then' -e 'tell application "Music" to get name of current track' -e 'end if')
  artist=$(osascript -e 'if application "Music" is running then' -e 'tell application "Music" to get artist of current track' -e 'end if')
fi

if ${title+"true"}; then
  title=$(echo "$title" | cut -b 1-15)
  artist=$(echo "$artist" | cut -b 1-15)
  echo "$artist • $title"
fi

tmux.conf

# -%<---
set -g status-interval 5
set -g status-justify left
set -g status-left ""
set -g status-right-length 60
set -g status-position top
set -g status-right "#[align=absolute-centre] %H:%M #[align=right]#{?client_prefix,#[noreverse] N #[reverse],} #(np) #{?#{==:#{pane_current_command},ssh},#[noreverse] #{pane_current_command} #[reverse],#{pane_current_command}} ♯#S "
if '! [ -z "$SSH_TTY" ]' 'set -g status-right "#{?client_prefix,#[noreverse] N #[reverse],} #{?#{==:#{pane_current_command},ssh},#[noreverse] #{pane_current_command} #[reverse],#{pane_current_command}} #(whoami)@#h ♯#S "'
set -g status-style reverse
set -g message-command-style reverse
set -g message-style reverse
set -g window-status-current-format "#[bg=black,fg=white,reverse] #I#{?window_zoomed_flag,+,} "
set -g window-status-format "#[fg=dim] #I#{?pane_synchronized,~,} "
set -g window-status-separator "#[fg=dim]"
set -g window-status-activity-style blink
# --->%-

I renamed the script np (no extension), and chmod +x. Of note, artiste and title are truncated to 15 characters each. The right status line of Tmux has been increased to 60 char; maybe you'll need more room depending on what you display in this part of the status line. Below is a screenshot of Neovim 0.11 and Cmus 2.12 running in Apple Terminal on macOS Sequoia 15.6.1. It also works with Apple Music.