Why can't play music at reboot?

OS info: uname -a Linux debian 5.10.0-18-amd64 #1 SMP Debian 5.10.140-1 (2022-09-02) x86_64 GNU/Linux I want to play music at reboot. sudo crontab -e @reboot /usr/bin/sleep 200;/usr/bin/mplayer /home/debian/welcome.mp3 No music play ,check cron log to see what happened: sudo journalctl -u cron | grep -e "root" |grep -e mplayer -A 3 Oct 17 20:07:46 debian CRON: (root) CMD (/usr/bin/sleep 200;/usr/bin/mplayer /home/debian/welcome.mp3) Oct 17 20:11:07 debian CRON: pam_unix(cron:session): session closed for user root The cmd in crontab starts at Oct 17 20:07:46,closed the session at Oct 17 20:11:07,almost 200seconds! import datetime start = datetime.datetime(2022, 10, 17, 20, 7, 46) end = datetime.datetime(2022, 10, 17, 20, 11, 7) end-start datetime.timedelta(seconds=201) It means that /usr/bin/sleep 200 executed ,but /usr/bin/mplayer /home/debian/welcome.mp3 never start ,why? Without /usr/bin/sleep 200 in crontab,the /usr/bin/mplayer /home/debian/welcome.mp3 only last 7 seconds!It is a 5 minutes long music! Oct 17 20:04:50 debian CRON: (root) CMD (/usr/bin/mplayer /home/debian/welcome.mp3) Oct 17 20:04:57 debian CRON: pam_unix(cron:session): session closed for user root Update to create cron with a regular user,the same log : Oct 17 21:37:26 debian CRON: (debian) CMD (/usr/bin/sleep 200;/usr/bin/mplayer /home/debian/welcome.mp3) Oct 17 21:40:48 debian CRON: pam_unix(cron:session): session closed for user debian Same action ,from start to end ,it last 202 seconds,almost 200 seconds. Update for adding a mplayer's log. Oct 17 22:25:11 debian CRON: (debian) CMD (/usr/bin/sleep 200;/usr/bin/mplayer /home/debian/welcome.mp3 2>/tmp/mplayer.reboot.log) Oct 17 22:28:33 debian CRON: pam_unix(cron:session): session closed for user debian cat /tmp/mplayer.reboot.log do_connect: could not connect to socket connect: No such file or directory Failed to open LIRC support. You will not be able to use your remote control. AO: [pulse] Init failed: Connection refused Failed to initialize audio driver 'pulse' [AO_ALSA] alsa-lib: pcm_hw.c:1715:(snd_pcm_hw_open) open '/dev/snd/pcmC0D0p' failed (-2): No such file or directory [AO_ALSA] alsa-lib: pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave [AO_ALSA] Playback open error: No such file or directory Failed to initialize audio driver 'alsa' [AO SDL] Unable to open audio: No available audio device Failed to initialize audio driver 'sdl:aalib' Could not open/initialize audio device -> no sound. Check the file: file /home/debian/welcome.mp3 /home/debian/welcome.mp3: Audio file with ID3 version 2.4.0, contains:MPEG ADTS, layer III, v1, 64 kbps, 48 kHz, Stereo THe playback hardware devices: aplay -l **** List of PLAYBACK Hardware Devices **** card 0: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Generic [HD-Audio Generic], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Generic [HD-Audio Generic], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: Generic_1 [HD-Audio Generic], device 0: ALC662 rev3 Analog [ALC662 rev3 Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 2: Generic_1 [HD-Audio Generic], device 1: ALC662 rev3 Digital [ALC662 rev3 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0